The verification sequence
A term sheet is not a commitment. It is an invitation to prove that everything you said in the deck is true. For most founders, that proof happens inside a data room — and the quality of what lives in that room determines whether the deal closes in four weeks or never.
UK Series A investors — from institutional VCs to family offices to SEIS-registered angel syndicates — follow a broadly consistent verification sequence. They check the same categories in roughly the same order because the same categories break the same deals. This article gives you that sequence, the specific documents investors pull first, and the errors that most reliably kill momentum before close.
On the data room vs the deck: Investors make the decision to term-sheet based on the deck. They make the decision to close based on the data room. These are different decisions, assessed against different standards. A great deck with a weak data room is one of the most common reasons deals fall apart in the UK market.
UK Series A funds typically assign one junior analyst to the data room before involving senior partners. That analyst is optimising for deal-killers — things that make the deal impossible to justify to the IC, regardless of how strong the product thesis is. They move through six categories in rough priority order.
Cap table and corporate structure
This is almost always the first check. Investors open the cap table before they open the financials, because a broken cap table can make a deal legally impossible to close regardless of the revenue numbers.
- Full dilution schedule including options pool, warrants, and any convertible notes or SAFEs
- SEIS / EIS advance assurance from HMRC — confirmed in writing, not verbal
- Companies House search: confirmation of corporate charges, share classes, and director history
- Any departed co-founders: have their shares vested, been bought back, or are they sitting fully-vested with no active involvement?
- Shareholding percentages match the Companies House confirmation statement
- No side letters or undisclosed shareholder agreements
The single most common deal-killer at this stage is a departed co-founder who left six months in but retained their full equity stake. A secondary issue is SEIS/EIS paperwork that was applied for but never confirmed — which means investors cannot obtain tax relief on the round they are leading.
Revenue verification
The deck says £X ARR. The data room proves whether that number is real. Investors triangulate across at least two independent sources — they will not accept a self-reported MRR spreadsheet as sufficient evidence.
- Management accounts for the last 12 months — P&L, balance sheet, and a cash reconciliation
- Bank statements for the last 6 months (redacted versions are rarely accepted; investors want clean exports)
- MRR bridge: month-by-month expansion, contraction, churn, and new business for the last 12 months
- Customer contracts: signed agreements for the top 5 customers by ARR
- Payment processor exports (Stripe, GoCardless, or similar) — cross-referenced against stated ARR
- Invoice register for the last 12 months if on annual contracts
The two most common failures here: ARR that includes one-off professional services revenue, and MRR that cannot be reconciled with bank movements to within 10%. Either can produce a significant downward revision to the claimed metric — and the trust damage from discovering a discrepancy is often worse than the number itself.
Intellectual property assignment
This is a legal check, but it surfaces as a data-room item because investors need to see the IP assignment agreements before they can confirm that the company actually owns what it is being valued on. The key question is simple: was all code, design, and invention created by the company, or was some of it created by a founder, contractor, or employee before the company existed?
UK investors look for:
- IP assignment agreements signed by all co-founders at or before incorporation
- Contractor agreements with explicit IP assignment clauses for any material development work
- Employee contracts with standard IP assignment provisions
- No open-source components used in a way that would require the product to be open-sourced under a copyleft licence
Common mistake: founders who built the first version of the product while employed elsewhere, without formal assignment or written permission from that employer, can create a disputed IP claim that makes the company uninvestable. If this applies to you, get legal advice before the data room opens — not after investors raise the issue.
Team and employment
The founding team is often the primary investment thesis at Series A. Investors verify the team in two ways: desk research (LinkedIn, prior company filings, press coverage) and document review inside the data room.
- Employment contracts for all key personnel — particularly any who were recruited pre-revenue
- Founders’ agreements confirming vesting schedules (standard UK 4-year vest with 1-year cliff)
- References to any non-compete or non-solicitation obligations from prior employment
- Confirmation that the CTO or technical lead is employed by (not contracted to) the company
Legal, regulatory, and compliance
At Seed, this category is often minimal. At Series A, it expands significantly — particularly if the company handles personal data, operates in a regulated sector, or has customers outside the UK.
- Data Processing Agreement (DPA) — especially if the company processes personal data under UK GDPR
- Privacy policy and cookie policy: current and published
- Any correspondence with the ICO or other regulators
- Material customer contracts: auto-renewal clauses, termination provisions, and liability caps
- Insurance: professional indemnity and cyber insurance policies
- Board minutes for the last 24 months — investors check for any resolutions that contradict founder representations
- HMRC correspondence: any open enquiries, R&D tax credit claims and confirmation letters
Market size and competitive claims
UK institutional investors verify market-size claims with increasing rigour as the round size grows. At Series A (typically £2m–£10m in the UK market), investors expect primary or credible secondary sourcing for every quantitative market claim in the deck.
| Claim type | Acceptable sources | Risk level |
|---|---|---|
| TAM (total addressable market) | IBISWorld, Euromonitor, Gartner, ONS, UK government statistical releases | Low if sourced |
| TAM from press release or vendor report | Only if the methodology is published and independently replicable | Medium |
| AI-generated market size figure | Not acceptable as a standalone source at Series A | High |
| Competitor comparison claims | G2, Capterra, publicly filed accounts, or direct feature documentation | Low if dated |
| Growth rate benchmarks | Must be sourced to the same report used for the TAM figure | Medium |
The standard for market claims at Series A is not perfection — it is sourced, dated, and internally consistent. Investors do not expect founders to have commissioned original research. They do expect every number to trace back to a credible third-party document that they can read themselves.
What a well-prepared data room looks like
The best data rooms share one structural quality: they anticipate questions and answer them before the investor asks. This is not about padding the room with documents — it is about organisation and pre-emptive disclosure.
The recommended folder structure for a UK Series A data room:
- Corporate — Articles of association, shareholding register, Companies House confirmation, SEIS/EIS advance assurance, incorporation documents
- Financials — Management accounts (12mo), bank statements (6mo), financial model (3-year base + downside), MRR bridge, payment processor export
- Legal — IP assignments, employment contracts (key hires), material customer contracts, DPA templates, insurance certificates
- Commercial — Customer list (top 10 by ARR), churn cohort analysis, pipeline (CRM export), LOIs or signed contracts in progress
- Market — TAM sources (full reports, not page screenshots), competitive landscape (dated), any third-party market research
- Team — CV / bio for each key hire, LinkedIn URLs, vesting schedules, any prior employment obligations
- Board — Board minutes (24mo), any shareholder resolutions, cap table history
On timing: the data room should be substantially complete before the term sheet is signed — not after. Founders who begin building the room post-term-sheet spend the first two weeks of due diligence in recovery mode, which signals operational immaturity and erodes the investor’s confidence at exactly the wrong moment.
The founders who close Series A rounds fastest are not those with the best decks — they are those who arrived at the term sheet with a data room that was already 80% complete. This requires building the room as a live document throughout the company’s operating life, not as a pre-fundraise sprint. Practically, this means signing IP assignment agreements at incorporation, filing HMRC R&D tax credit claims annually, maintaining signed copies of every material customer contract in a single accessible location, and producing monthly management accounts from month one.
Errors that kill deals before close
Based on patterns across the ThriveFinity deal-analysis dataset, the due-diligence failures that most reliably cause a signed term sheet to fall apart before close are, in frequency order:
- ARR-to-bank reconciliation gap. The stated ARR cannot be reconciled with bank movements. Even a 15% gap triggers a complete recount of all revenue figures and frequently produces a downward revision to the round valuation.
- Cap table with departed co-founder equity. A co-founder who holds 20–30% of the company and departed 18 months ago, with no buyback, no vesting cliff, and no shareholder agreement governing their involvement, is a structural deal-blocker.
- IP in a founder’s personal name. Particularly common with solo technical founders who built v1 before the company existed. Without a clean IP assignment, the company’s core asset may not belong to the company.
- Market-size claims that don’t hold on inspection. A TAM cited to a press release that links to a report which investors purchase and find does not support the cited figure destroys credibility on every other number in the deck.
- Missing SEIS/EIS paperwork. Particularly damaging when the investor has structured the round to use EIS relief. If advance assurance was not obtained, the investor’s tax position changes materially.
❓ Common Questions
What should be in a Series A data room?
What do Series A investors verify first in due diligence?
How long does Series A due diligence take in the UK?
What kills Series A deals at due diligence?
Do UK Series A investors verify market size claims?
What is the difference between a Series A data room and a seed data room?
Sources
- Docsend — “How Investors Evaluate Startup Decks” (2022). Investor decision-making patterns and document viewing data from 2.5m+ deck views.
- HMRC — SEIS and EIS Advance Assurance guidance (GOV.UK, current). Requirements and application process for advance assurance.
- Companies House — UK corporate registration data (companieshouse.gov.uk). Public access to filed accounts, charges register, and director history.
- Beauhurst — “The Deal: UK Startup Funding in 2025”. Series A round sizes and due diligence timelines for UK deals.
- British Business Bank — “Small Business Equity Tracker” (2025). UK equity investment data by stage, sector, and region.
Put this into practice: Verify your deck’s market claims before investors open your data room — ThriveFinity Pre-Launch Verification →
