Pitch Deck or Business Plan: What UK Founders Actually Need

Founders at the start of their fundraising journey frequently ask the same question: do I need a pitch deck or a business plan? The answer is: it depends. 

Jay Dickieson, Founder and Managing Director of PitchBuilder, has worked with 500+ UK founders across more than £700m in funding rounds. Here is the honest breakdown.

What each document is for

A pitch deck is a 10–15 slide visual presentation designed to generate investor interest quickly. It covers the problem, solution, market, business model, traction, team, and funding ask in enough depth to earn a meeting - but often not to close a deal. Its audience is investors who will use it to decide whether the business is worth more of their time.

A business plan is a detailed written document — typically 30 to 40 pages — that maps out your business strategy, market analysis, operational structure, and financial forecasts comprehensively. It is read carefully, usually after initial interest has been established, or when a formal due diligence process begins. It is also the primary document required for bank loan applications and many grant applications.

The key distinction: a pitch deck sparks interest. A business plan provides proof. You need a pitch deck to open the door and, in some cases, a business plan to walk through it.

We often advise founders to build their business plan first, then use this thinking, research and data to build your pitch deck. It is critical they are completely aligned. 

What UK equity investors actually ask for

At pre-seed and seed stage, UK angel investors and early-stage VCs want a pitch deck. Almost none of them ask for a business plan as the first document. Many don't ask for one at all — due diligence at early stages typically involves the deck, a financial model, and a series of conversations rather than a formal written plan.

This doesn't mean strategic thinking is irrelevant. Investors can tell immediately whether a founder has done the underlying work. A pitch deck built on rigorous thinking about the market, the model, and the competition is visibly different from one built without it. But the investor doesn't want to read 40 pages of that thinking — they want to see the conclusions, supported by enough evidence to be credible.

A well-constructed pitch deck is, in many ways, a distillation of the thinking that would go into a business plan. The founder who has done the business plan work will almost always build a better deck. The investor, however, still wants the deck.

When you genuinely need a business plan

Bank loans and debt financing. If you are raising through a bank — whether through Startup Loans, commercial lending, or any other debt product — the bank will require a business plan. This is standard practice and will not be waived for a pitch deck. The format a bank expects differs from an investor-focused deck: more operational detail, formal financial projections with supporting assumptions, and a clear repayment model.

Grant applications. Many UK grant programmes — Innovate UK, regional growth funds, and sector-specific schemes — require a business plan as part of the application. Check the specific requirements, as these vary significantly. Some grant programmes accept a detailed executive summary and financial model; others require a full written plan.

SEIS and EIS advance assurance. HMRC's advance assurance process for SEIS and EIS investment requires a clear description of the company's business activities, planned use of funds, and trading history. While this can be accomplished with a pitch deck, the end result (clearly addressing their required criteria) often looks closer to a business plan executive summary than to a pitch deck. Founders who have done the business plan work find this process considerably easier.

Late-stage fundraising. At Series A and beyond, institutional investors will request detailed financial models and may request a written strategic plan as part of diligence. This is not typically a traditional business plan format, it's more likely a detailed operating plan, a three-year financial model with full assumptions, and a written strategy document. But the underlying principle is that investors want more depth as the investment size grows.

Internal alignment. Even if no investor ever asks for it, writing a business plan is a valuable exercise for founders. It forces clear thinking about strategy, market assumptions, and operational requirements. Many founders who have done it report that it substantially improved the quality of their pitch deck, because the work of writing clearly about the business surfaces gaps and inconsistencies that the deck doesn't expose.

The sequencing question

The question "pitch deck or business plan?" is often really a sequencing question: which comes first?

The practical answer for most UK founders raising equity investment is:

Start with the work that would underpin a business plan:

• market research
• competitive analysis
• financial modelling
• unit economics

All without necessarily writing the formal document. This thinking informs every slide of the pitch deck.

Build the pitch deck. This is what generates investor conversations.

At pre-seed and seed, this is often sufficient. At Series A, a more formal operating plan may be requested as part of diligence.

Write a full business plan if and when you pursue debt financing, grant applications, or if you need it for SEIS/EIS submissions.

The document that does neither job well

The document that causes the most problems is neither a proper pitch deck or a proper business plan: it is a hybrid that tries to be both. Usually 25 to 40 slides, it contains the visual language of a pitch deck but the comprehensiveness of a business plan. It is too long for an investor to skim and too shallow for a bank to approve. It covers everything without saying anything decisively.

This hybrid tends to emerge when founders are uncertain which document they need and try to satisfy both audiences simultaneously. At PitchBuilder we see this a lot and really try to focus on our clients on producing the material investors expect, in the format they expect. That includes:

• a tight, investor-focused pitch deck for equity fundraising, and
• a separate written plan when a formal document is needed.

PitchBuilder's services

For most founders starting the equity fundraising process, the pitch deck review is the right starting point — identifying exactly what needs to change before the deck reaches investors. For founders who need a full deck built, or a business plan written we'd suggest starting with a free consultation.