How to Write a Business Plan: A Practical Guide for UK Small Businesses
Writing a business plan sounds like something you only need if you’re pitching to investors. In reality, it’s one of the most useful things you can do for your business — regardless of whether anyone else ever reads it.
Do you actually need a business plan?
It depends on your situation — but the honest answer is: almost certainly yes, even if nobody else ever asks to see it.
Research suggests that businesses with a written plan are significantly more likely to grow. 50% of companies with a business plan report positive growth — nearly double the 27% of those without one. And if you’re looking for external funding, a business plan is non-negotiable.
You will almost certainly need one if you are:
- Applying for a business loan from a bank or the British Business Bank
- Seeking investment from angel investors or venture capitalists
- Applying for certain grants — particularly government-backed ones
- Entering a formal partnership or taking on a major contract
- Planning a significant expansion or pivot
How long should a business plan be?
As long as it needs to be, and no longer. A 40-page plan full of padding is less useful than a tight 10-page plan that clearly covers the essentials.
For most UK small businesses and startups, aim for 10–20 pages. If you’re seeking significant investment or a substantial loan, a more detailed plan will be expected. If you’re writing it primarily for your own planning purposes, shorter is fine.
The seven key sections of a business plan
Most business plans for UK small businesses cover the same core areas. Here’s what to include in each:
Write this last, even though it appears first. It’s a one- to two-page summary of the entire plan — what your business does, who it’s for, what makes it different, and what you’re asking for (if anything). It’s the section investors and lenders read most carefully. Make it clear, specific, and honest.
A concise description of your business: what you do, how long you’ve been trading (or when you plan to start), your legal structure (sole trader, limited company, partnership), and where you’re based. Include a plain-English mission statement — one or two sentences is enough.
What exactly are you selling? Be specific. Explain what the product or service is, how it’s delivered, what it costs, and what makes it different from competitors. If you have intellectual property — a patent, trademark, or proprietary process — mention it here.
This is where many business plans fall short. A market analysis isn’t just citing a market size figure — it needs to demonstrate that you understand your specific customers and competitors. Cover who your target customers are and what problem they have, who your competitors are and how you compare, and whether the market is growing or shrinking.
How will you find customers and convert them? Cover your channels (search, social, referrals, events, partnerships), your pricing strategy, your sales process, and any existing customers or contracts. Existing customers are gold dust in a business plan — mention them if you have them.
The practical side of running the business: key suppliers, premises and equipment, licences and regulatory requirements, key team members and their experience, and any skills gaps you’re planning to fill. For UK businesses, include relevant compliance obligations — GDPR, health and safety, sector-specific regulations.
The most important section. Include a profit and loss forecast (at least 12 months, ideally three years), a cash flow forecast (month by month for 12 months), your funding requirements if applicable, and a break-even analysis. Be realistic — optimistic projections that don’t stack up are one of the most common reasons business plans fail to secure funding.
Can you write a business plan yourself?
Yes — and for most small businesses, you should. Writing your own plan forces you to think through the details yourself rather than delegating that thinking to someone else.
There are good free templates available that make the process straightforward:
- gov.uk/write-business-plan — the government’s official guidance and free template, updated regularly. Well structured and covers all the key sections.
- Start Up Loans — government-backed loans for new businesses, with free mentoring and a business plan template at startuploans.co.uk
- Prince’s Trust — support and templates for younger entrepreneurs (under 30)
- Your local Growth Hub — free, expert business planning support across England, funded by the government. Find yours at great.gov.uk
Where professional input helps
Your accountant should review your financial projections — they’ll spot errors and help make them credible to lenders. A solicitor is worth consulting if your plan involves complex contracts, partnerships, or intellectual property. Some banks also offer free business planning support to customers — worth asking.
Common mistakes to avoid
| Mistake | Why it matters | What to do instead |
|---|---|---|
| Making it too long | Length doesn’t equal quality — a padded plan loses the reader | Aim for 10–20 pages. Cut anything that doesn’t add specific information |
| Ignoring competition | Claiming no competitors is a red flag — it suggests you haven’t looked | Acknowledge competitors honestly and clearly explain your advantage |
| Unrealistic financials | The most common reason plans fail to secure funding | Start conservatively. Show your assumptions and how you’ll grow |
| Writing it once and filing it away | A plan that’s never updated quickly becomes irrelevant | Review annually at minimum — and whenever something significant changes |
| Missing UK-specific obligations | Companies House, PAYE, auto-enrolment, VAT — all need to be in your financials | Get your accountant to sense-check the compliance and tax sections |
Free UK resources for writing your business plan
- gov.uk/write-business-plan — the official government guidance and template. Free, well structured, and regularly updated.
- British Business Bank — detailed guidance for businesses seeking finance at british-business-bank.co.uk
- Start Up Loans — government-backed loans with free mentoring and planning templates at startuploans.co.uk
- Business Gateway (Scotland), Business Wales, Invest NI — devolved equivalents with local business planning support
- Your local Growth Hub — free expert support across England. Find your nearest at great.gov.uk
More guides for UK small business owners
Right Hand Man covers everything from business planning and cash flow to hiring your first employee and pricing your services. Browse our guides or get in touch if you have a question.