CIS-first invoicing
Frequent cash-and-tax workflow; clear UK language; easiest to validate through real invoices and remittances.
Executive dashboard
The decision, first
Test CIS-first invoicing, then add RAMS only after paid retention. The pair shares one buyer and one acquisition engine; most alternatives require a new audience, new support model or heavier integration.
10proven-category opportunities
8 + 2UK and international split
170£59 bundle customers for £10,030 MRR
£29first product’s proposed monthly price
Recommended path
One construction platform. Two narrow modules.
Start with quotes, CIS-aware invoices and remittance reconciliation. Earn the right to add RAMS review, version approval and worker acknowledgement. Shared jobs, clients, sites and workers make this a genuine pair—not portfolio sprawl.
Employment-rights tracker
Strong standalone ARPA and regulatory urgency, but users may demand advice rather than software.
RAMS approval + sign-off
Best companion product. Win on approval evidence, not unsafe “AI-compliant” document generation.
Comparison
All ten at a glance
Filter by market or commercial decision. Search matches the opportunity and niche. Scores are judgement-led summaries of the evidence; “competition” scores higher when the field is more manageable.
Showing all 10 opportunities.
| # | Opportunity | Market | ARPA | Customers | Demand | Pain | Diff. | UK fit | Reach | MVP | Revenue | Retention | Competition | £10k | Mean | Decision |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | CIS-first invoicing | UK | £29 | 345 | 9 | 8 | 8 | 10 | 8 | 7 | 8 | 9 | 5 | 8 | 8.0 | Test first |
| 2 | Employment-rights tracker | UK | £79 | 127 | 10 | 8 | 8 | 10 | 7 | 7 | 9 | 9 | 4 | 8 | 8.0 | Strong |
| 3 | Small-garage front desk | UK | £69 | 145 | 9 | 8 | 7 | 10 | 7 | 6 | 9 | 9 | 5 | 8 | 7.8 | Strong |
| 4 | Funeral case workflow | UK | £99 | 102 | 8 | 9 | 7 | 10 | 6 | 5 | 9 | 10 | 6 | 7 | 7.7 | Trust-led |
| 5 | RAMS approval + sign-off | UK | £39 | 257 | 9 | 8 | 7 | 10 | 8 | 7 | 8 | 8 | 4 | 7 | 7.6 | Companion |
| 6 | Low-volume Shopify returns | International | £49 | 205 | 10 | 8 | 7 | 8 | 8 | 8 | 8 | 9 | 3 | 7 | 7.6 | Crowded |
| 7 | Bookkeeping practice workflow | International | £59 | 170 | 10 | 8 | 6 | 8 | 7 | 7 | 8 | 10 | 4 | 7 | 7.5 | Sharper niche |
| 8 | Mobile-caterer safety log | UK | £39 | 257 | 8 | 7 | 6 | 10 | 8 | 8 | 6 | 8 | 5 | 6 | 7.2 | Conditional |
| 9 | Martyn’s Law evidence | UK | £39/site | 257* | 8 | 8 | 5 | 10 | 8 | 8 | 7 | 7 | 4 | 6 | 7.1 | Partner only |
| 10 | Tenancy evidence passport | England | £24 | 417 | 10 | 7 | 5 | 10 | 7 | 8 | 6 | 8 | 3 | 6 | 7.0 | Crowded |
* Single-site arithmetic; viable Martyn’s Law model is likely portfolio pricing.Confirmed evidence does not make any score a forecast.
Opportunity dossiers
What to build—and what not to
Open each dossier for the evidence, incumbent pattern, recurring pain, market wedge, MVP, economics and failure case.
confirmed inference test01CIS-first invoicing for subcontractorsInvoicing/accounting · UK construction sole traders and micro-firms8.0 / 10
“CIS correct before the invoice leaves your phone.”
Established payment
Xero, QuickBooks, FreeAgent, Tradify, Powered Now and Joist charge for accounting, trade workflow or contractor invoicing. HMRC says MTD Income Tax is live above £50k and extends to £30k in 2027 and £20k in 2028.
Incumbent pattern
General ledgers bundle bank reconciliation, VAT, reports and add-ons; trade suites add job scheduling and teams; Joist is simple but not UK CIS/MTD-first.
Validated recurring pain
Recent discussions repeat the same loop: software feels overbuilt, labour/material deductions confuse users, remittance statements do not reconcile cleanly and reverse-charge wording creates uncertainty. This happens whenever money is received—not once a year.
Feature translation
Explicit labour/material lines; deduction preview; reverse-charge wording; remittance PDF extraction with review; gross/withheld/cash view; accountant-ready audit export.
Why incumbents leave room
General ledgers optimise for accountants and many sectors; trade suites optimise scheduling. The narrow “subcontractor being paid” workflow is too small to reshape their products and can cannibalise add-ons.
MVP / later
Essential: customer/job, quote-to-invoice, CIS/reverse-charge rules, PDF/share, payment/remittance match, reminders, export. Later: bank feeds, receipts, accountant portal and recognised HMRC submission.
Economics & route
£19 Solo / £29 Pro / £59 RAMS bundle. 345 at £29 = £10,005 MRR. Reach through CIS accountants, trade communities, merchants and demonstration-led content. Self-serve to seven-day cycle.
Failure / test
Could fail because FreeAgent/Xero is good enough or free through banks, buyers cap willingness near £10, or HMRC assurance is underestimated. Require 10 paid users, repeat use and accountant-verified scenarios.
Representative evidence
HMRC MTDHMRC populationTradifyJoist reviewsCIS/MTD discussionCIS workflow
02Employment-rights rollout trackerHR compliance · UK employers with 5–49 staff and no HR team8.0 / 10
“Employment-law actions for under 50 staff. £79. Cancel any time. No sales call.”
Established payment
BrightHR, Breathe, Peninsula, Citation and Croner sell HR software/advice. BrightHR starts around £3 per employee; its review volume is in the thousands. Breathe reports 16,000+ UK SMEs.
Regulatory trigger
Government’s July 2026 timeline confirms phased Employment Rights Act work; six-month unfair-dismissal qualification is expected January 2027. The 2026 compensatory cap is £123,543.
Validated recurring pain
Users pay for leave records and advice, but cross-platform complaints repeat high-pressure sales, quote-only prices, long contracts, narrow cancellation windows and automatic renewal. Small firms ask for compliant basics rather than an HR suite.
Feature translation
Dated obligation feed; named tasks/evidence; new-hire six-month clock; prompts at weeks 4/12/20/22; training/policy acknowledgements; tribunal-ready export.
Why room remains
Broad bundles, per-head expansion, helplines and insurance drive incumbent economics. A transparent software-only tool undermines that model.
MVP / later
Essential: timeline, employee clocks, task/evidence log, reviewed template set, reminders/export. Later: adviser network, HRIS/payroll integrations and insurance. No case-specific legal advice in v1.
Economics & route
£49 / £79 / £119 by headcount; 127 at £79 = £10,033 MRR. Accountants, payroll bureaux, employment solicitors, chambers and franchisors. One-to-four-week sale; high retention and support.
Failure / test
Buyers may require advice/insurance or distrust a young vendor with dismissal evidence. Secure paid employers and a practising-solicitor content agreement before build.
Representative evidence
Official timelineBrightHR pricingTrustpilotCitation discussionPeninsula reviews
03One-to-five-bay garage front deskWorkshop management · small UK MOT/service/repair garages7.8 / 10
“Today’s jobs, approvals and invoices—without an ERP.”
Established payment
Garage Hive starts at £145/month; public comparisons place TechMan around £189–£415 and simpler systems around £50–£120. Great Britain had 22,448 active MOT stations in 2024–25.
Incumbent pattern
Full workshop control: diary, job sheets, estimates/invoices, reminders, technician time, parts, stock, courtesy cars, DVSA and accounting integrations.
Validated recurring pain
UK discussions compare many tools and describe some as complicated, US-centric or costly after licences/onboarding. Paper diary + invoices + WhatsApp photos is the repeated workaround. Independent review volume is thin, so primary interviews matter more.
Feature translation
Live day-board; vehicle/customer; voice-to-job notes and photos; approval by link; approved estimate to invoice; service/MOT reminders; simple daily cash view.
Why room remains
Incumbents retain and monetise through more modules, seats and integrations. A shallow product for one-to-five bays produces less ARPA.
MVP / later
Essential: records, day-board, job card, estimate/approval, invoice, reminders, import/export. Later: DVSA/VRM data, parts, stock, time clock, booking and payments.
Economics & route
£69/workshop; 145 = £10,005 MRR. Garage visits, factors, MOT trainers and trade media. Two-to-six-week sale; excellent retention but costly migration/support.
Failure / test
Could require integrations before switching, or migration may destroy CAC. Five pilots must import real histories and run the working day for four weeks.
Representative evidence
04Independent funeral-director case workflowCase management · UK firms with one to three branches7.7 / 10
“One calm case board. No re-keying. Safe hand-offs.”
Established payment
Eulogica has around 20 products and a 150-page manual; Capterra lists dozens of funeral products. New UK products list £79–£149 per branch or per-funeral prices. CMA price-list duties create UK-specific work.
Evidence gap
Independent UK software reviews are sparse. Industry material confirms paper/re-keying constraints; severe care failures show stakes but do not prove software causation. This dossier needs paid observation, not fear-led marketing.
Recurring pain
Every case repeats intake, dates, hand-offs, forms, disbursements and care records. The workflow is structurally recurring and a missed step can be devastating.
Feature translation
First-call intake once; role-based case checklist; QR chain of custody; blocked/overdue tasks; forms; estimate/disbursement reconciliation; family approval; ashes-return confirmation.
Why room remains
Legacy vendors protect deep installations; international products avoid UK forms/CMA wording. Recent UK entrants mean the modernisation window is narrowing.
MVP / later
Essential: case stages, contacts, care/ashes chain, calendar, documents, estimates/invoices, audit and encrypted export. Later: notices, stationery, donations, pre-paid plans, fleet and livestream integrations.
Economics & route
£99/branch + £249 migration; 102 branches = £10,098 MRR. NAFD/SAIF, suppliers and demonstrations. One-to-three-month trust-led sale; exceptional retention and high support/security.
Failure / test
Could be too relationship-bound, saturated by recent entrants or require 24/7 support. Require three paid design partners and observation of ten real cases.
Representative evidence
EulogicaEulogica manualCapterra categoryCurrent UK pricingCMA review
05RAMS approval and worker acknowledgementConstruction safety workflow · subcontractors with 2–20 workers7.6 / 10
“Get RAMS approved and signed—not merely generated.”
Established payment
HandsHQ, RAMs App and HS Direct monetise RAMS/COSHH/training. HandsHQ includes content, digital signatures, approval and integrations; Capterra users say it replaces difficult Word/Excel work and saves hours.
Validated recurring pain
Small firms spend time adapting templates. Reviewers report clicks, COSHH search and re-entry friction. More importantly, safety professionals warn generic/fast AI RAMS can be rejected or unsafe and require competent, site-specific review.
Real wedge
The costly loop is submit → reject/comment → revise → reissue → brief workers → prove the current version was seen. PDF generation is already crowded.
Feature translation
Import existing documents; site-specific cover; client comments by section; version comparison; old-link invalidation; QR worker acknowledgement; competence expiry; audit export.
Why room remains
Established tools monetise proprietary content. Supporting arbitrary Word/PDF documents and low-cost external reviewers weakens that lock-in.
MVP / later
Essential: upload, review/comments, states, versions, QR sign-off, worker register/export. Later: authoring content, COSHH, CPP, principal-contractor integrations and AI completeness checks.
Economics & route
£19 Solo / £39 Team / £59 bundle; 257 at £39 = £10,023. Same channels as invoicing plus H&S consultants and principal contractors.
Failure / test
Principal contractors may force their own portals; users may expect content; liability may be uneconomic. Validate rejection frequency with both sides and obtain professional-indemnity advice.
Representative evidence
HandsHQPlans/featuresCapterra reviewsHSESmall-firm discussionSafety warning
06Low-volume Shopify returnsReturns/exchanges · international small apparel/accessory brands7.6 / 10
“Returns without paying for returns you do not have.”
Established payment
Loop, ReturnGO, AfterShip, Return Prime and PostCo have hundreds/thousands of merchant reviews. ReturnGO is 4.8/5 from 357 reviews and starts at $147 for 110 returns.
Validated recurring pain
Merchants value portals and exchange retention but repeatedly call $99–$155 excessive at low volume. Plans include unused volume; stock overrides, refund timing and bloated policy tools create work.
Feature translation
Lightweight portal; plain policy builder; photo proof; approve before/after receipt; exchange/reserve-stock override; warehouse state; weekly reasons.
Why room remains
High-volume brands produce better subscriptions and label economics. Low-volume merchants cost almost as much to support.
MVP / later
Essential: Shopify order lookup, rules, request/photo, approve, exchange/credit, labels/manual instructions, notifications, refund queue. Later: carriers, 3PL, fraud and duties.
Economics & route
£15 base + £0.75/return, £49 cap; assume £49 blended. 205 = £10,045 MRR. App Store, agencies and fulfilment partners; good retention but merchant failure churn.
Regulatory / technical
Medium-high: Shopify API/platform rules, carrier/theme changes, consumer-return rights, privacy and refund/payment scope.
Failure / test
Native Shopify may be enough; manual work may win at low volume; App Store acquisition is crowded. Measure saved support minutes in a concierge portal.
Representative evidence
ReturnGO listingLoop listingPrice discussionWorkflow discussion
07Bookkeeping-only practice workflowPractice management · remote firms with 1–10 staff7.5 / 10
“Month-end close: clients, blockers and evidence on one screen.”
Established payment
Financial Cents, Karbon, TaxDome, Jetpack and Canopy charge recurring subscriptions. Financial Cents lists $19 Solo, $49/user Team annual and $69 monthly, with strong G2/Capterra ratings.
Validated recurring pain
Users consistently value recurring templates, document reminders and remote-team visibility. Per-user cost, minimum users, setup breadth and incomplete ledger-review connections recur as drawbacks.
Feature translation
Client-by-month close board; checklist; no-login request/upload; reminder sequence; ledger deep links/exceptions; blocker owner; request/respond/review trail.
Why room remains
Per-seat expansion and broad tax/audit suites drive incumbents. A bookkeeping-only flat-price product deliberately leaves features and revenue behind.
MVP / later
Essential: clients, recurring work, assignments, blockers, client links, reminders, history/dashboard. Later: direct ledger exceptions, capacity, e-signature, billing.
Economics & route
£29 Solo / £59 Firm / £99 Growth; 170 at £59 = £10,030. Bookkeeping communities, adviser directories and template-led content; excellent embedded retention.
Regulatory / technical
Medium: confidential financial data, international privacy/security expectations and integration approvals. Avoid ledger write-back initially.
Failure / test
Financial Cents is already affordable and strong; firms may demand CRM/email/time/billing. Switching behaviour, not feature enthusiasm, is the key test.
Representative evidence
Financial Cents pricingG2 reviewsPractitioner discussionKarbon comparison
08Mobile-caterer food-safety evidenceDigital HACCP/SFBB · food trucks, market traders and event caterers7.2 / 10
“SFBB evidence that travels with your van.”
Established payment
FoodDocs, Trail, Leafe and others charge roughly £28–£59+ per location; FoodDocs’ broader G2 plans reach $199–$299. The FSA requires documented HACCP-based procedures but also provides free SFBB/MyHACCP routes.
Validated recurring pain
Reviews validate value in removing paper, remote verification and audit export. The harder repeated issue is adoption: managers buy a system but frontline staff ignore it. Mobile traders add changing site, menu and connectivity.
Feature translation
Offline “today’s pitch”; QR task launch; timestamped temperature checks; event-specific menu/allergen version; photo corrective action; missed-check escalation; one-tap EHO pack.
Why room remains
Multi-site incumbents favour permanent estates with management dashboards. Mobile caterers are smaller, seasonal and support-intensive.
MVP / later
Essential: offline diary, open/close/temperature/cleaning, corrective action, allergens, reminders/export. Later: probes, traceability, training and adviser review.
Economics & route
£19 Solo / £39 Team; 257 at £39 = £10,023, before seasonal pauses. Event organisers, trader networks, colleges and consultant referrals.
Regulatory / technical
High safety/allergen exposure; medium technical complexity with offline sync. It must support competent judgement, not replace it.
Failure / test
Free SFBB/paper may be good enough; staff may reject phone use; £39 may exceed WTP. Test completion during real shifts.
Representative evidence
09Martyn’s Law evidence for volunteer venuesCompliance management · halls, faith venues and sports clubs7.1 / 10
Portfolio evidence for umbrella bodies—not another £29 compliance wizard.
Confirmed trigger
Official guidance places premises expecting 200–799 people in standard tier and describes procedures, training/testing and up to £10,000 non-compliance penalties.
Competitive warning
Premly charges £49 once/£15 monthly/£149 yearly; SafeHall advertises £29/year; Prova Risk £399/year. The SIA is building an official portal and government warns against guaranteed-compliance claims.
Recurring pain
Annual review, volunteer turnover, drills and version acknowledgement recur. Initial document generation is one-off and increasingly commoditised. Mature independent software reviews do not yet exist.
Feature translation
Scope record; premises-specific rationale; procedure wizard; acknowledgement; drill/review log; versioning; portfolio exception dashboard; export; optional qualified human review.
Why room remains
Low-cost entrants sell single-venue documents; enterprise security tools sell to enhanced estates. Volunteer portfolios need delegated governance and low per-site economics.
MVP / later
Essential: portfolio/venue, official-linked scope, procedures/evidence, volunteer acknowledgement, drills, versions/exceptions. Later: training, adviser/insurer integrations. No “official certificate”.
Economics & route
Real model: £8–£15/site with £500–£1,500 portfolio minimum; around 1,000 sites at £10 equivalent. Two-to-six-month umbrella-body sale; high volunteer support.
Failure / test
Official tools may suffice; price is compressing; human review may ruin margin. No-go without a design partner controlling at least 100 venues.
Representative evidence
10Tenancy compliance evidence passportLandlord software · self-managing landlords with 1–5 properties7.0 / 10
“The evidence file for each tenancy—not landlord accounting.”
Established payment
Landlord Studio, Hammock, Landlord Vision and Arthur already monetise this audience. Landlord Studio reports 80,000+ landlords and £12/£24 plans with MTD, reminders, documents and tenancy tools.
Regulatory trigger
Renters’ Rights Act restrictions began 1 May 2026. Failure to provide the official information sheet by 31 May could attract up to a £7,000 penalty.
Validated recurring pain
Discussions show active payment and fragmentation between bank-feed accounting, certificate reminders, document stock and maintenance. Yet incumbents are rapidly bundling all of these.
Real wedge
Not another reminder vault: prove what was served, when, which version and how receipt was evidenced; export a solicitor/court-ready timeline.
Why room remains
Accounting-led tools focus bank feeds/MTD; agent systems focus portfolio operation. Forensic service/receipt history is narrower and legally burdensome.
MVP / later
Essential: tenancy checklist, document versions, service/acknowledgement, expiries, evidence export, adviser share. Later: forms, maintenance, MTD and solicitor network.
Economics & route
£12 / £24 / £39 by portfolio; 417 at £24 = £10,008 MRR. Associations, brokers, solicitors, insurers and accountants. Good retention, low ARPA, high legal support.
Failure / test
Existing tools can add the feature; NRLA membership may make it free; advisers may not trust exports. Validate with landlords who have served notices, not only anxious newcomers.
Representative evidence
Official enforcementInformation sheetLandlord Studio pricingSoftware discussion
Revenue scenarios
Arithmetic, not prophecy
The numbers show the shape of each business. They exclude VAT, fees, refunds and discounts; none is a market-share forecast.
| Model | Customer mix | MRR | Commercial reading |
|---|---|---|---|
| CIS invoicing only | 345 × £29 | £10,005 | Simple story; larger support base |
| Employment tracker | 127 × £79 | £10,033 | Fewer accounts; legal support risk |
| Garage workflow | 145 × £69 | £10,005 | Strong retention; migration-heavy |
| Construction bundle | 170 × £59 | £10,030 | Best shared-audience route |
| Construction mixed | 120 bundle + 80 invoice + 20 RAMS | £10,180 | Credible staged portfolio |
| Funeral workflow | 102 × £99 | £10,098 | Lowest count; longest trust cycle |
Low-cost validation
Charge before code
Validate the cash-and-tax workflow with real artefacts, then run a separate HMRC technical gate. Complaints and clicks are insufficient.
100 recent reviews; 20 subcontractors, five accountants and five H&S reviewers. Ask for the last real invoice, remittance and RAMS revision.
Days 1–7 · £0–£100Two pages at £29 and £39. Ask for a paid setup or reservation, not a free waitlist.
Days 8–14 · £150–£300Concierge invoices, deduction matching and accountant export. Run RAMS approval for a small subset. Charge from month one.
Weeks 3–5 · under £300Test a three-minute invoice flow. Separately cost HMRC APIs, OAuth, fraud headers, recognition, content review and failure handling.
Weeks 4–6 · £0–£500Go only if
- 10 customers pay or place a meaningful deposit at the stated price.
- 70% repeat the workflow during the test.
- 12/20 observed users have monthly CIS pain with measurable cost.
- Two CIS accountants clear 30 scenarios with no unresolved error.
- A credible route exists below roughly £100 CAC or through a committed partner.
- HMRC route and ongoing support are costed.
No-go or reshape if
- Users praise simplicity but will not pay £29.
- Fewer than half repeat within 30 days.
- Most have an adequate free bank/accountant bundle.
- Tax edge cases require ongoing accountant intervention.
- Full bookkeeping, payroll, scheduling and bank feeds are demanded before switching.
- Qualified CAC exceeds six months of gross profit without a partner channel.
Method & limitations
How to read the evidence
Official sources establish rules and dates; vendor pages establish features and public prices; independent reviews and discussions expose workflows. None substitutes for paid customer discovery.
Seven-step screen
- Find multiple paid incumbents and recurring use.
- Define one narrow profession, context, rule or pricing mismatch.
- Triangulate official pages, pricing, reviews and discussions.
- Separate repeated paid jobs from product-specific bugs.
- Translate pain into the smallest measurable outcome.
- Test reach, retention, support, regulatory and integration load.
- Score comparatively; validate with money before build.
Limitations
This is desk research dated 6 August 2026. Review indexing is incomplete; B2B UK niches have sparse public feedback; vendor customer/savings claims are not audited; pricing changes; no market-size forecast is asserted. Legal, tax and safety content can change. New 2026 entrants validate competition, not durable demand. Scores express judgement, not probabilities.
The weakest evidence is in funeral-software reviews and new Martyn’s Law products. Those categories require paid design partners before any build decision.