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A marketing plan does not need to be a fifty-page document that sits unopened in a shared drive. For most small UK businesses, the plan that actually works is a single page with a handful of numbers on it, a clear list of what you will and will not do, and a regular slot in the diary to check whether any of it is working. Here is how to build one that survives contact with a real trading week.

Start With Three Numbers, Not a Strategy

Before you think about channels, work out what success actually looks like in numbers. You need three:

• Your revenue target for the next twelve months. Be honest rather than ambitious. A number you believe is more useful than one that impresses.
• Your average customer value. If a typical customer spends £400 with you, that tells you far more than your total turnover figure.
• Your current conversion rate. Out of ten enquiries, how many become paying customers? If you do not know, count the next twenty and find out.

Those three numbers do the heavy lifting. If you need £60,000 and your average customer is worth £400, you need 150 customers. If one in four enquiries converts, you need 600 enquiries across the year — roughly twelve a week. Suddenly "we should do more marketing" becomes "we need twelve enquiries a week". That is something you can plan around.

Set a Budget You Can Defend Every Month

Plenty of small businesses either spend nothing or spend in panicked bursts when things go quiet. Neither works. Set a monthly figure you can sustain in a bad month as well as a good one. For many sole traders and small firms, somewhere between £150 and £500 a month is realistic, and it does not all have to be cash — your own time counts, so put a value on it.

Split the budget roughly into three pots:

• Reach: paid ads, local advertising, sponsorship, printed flyers — anything that puts you in front of new people.
• Conversion: your website, your Google Business Profile, photography, testimonials, a decent quote template.
• Retention: email newsletters, a simple reminder service, a thank-you offer for repeat customers.

Retention is the pot most small businesses forget, and it is usually the cheapest place to find extra revenue. A customer who already trusts you is far easier to sell to again than a stranger.

Pick Two Channels and Go Deep

The most common mistake is spreading yourself across six platforms and doing all of them badly. Choose two. Three at a push. Before you commit, ask three questions about each channel:

• Are my customers already there? A building firm does not need TikTok; it needs local search visibility and word of mouth.
• Can I keep it up for six months? A channel you abandon after three weeks is worse than one you never started.
• Can I measure it? If you cannot tell whether it brought you enquiries, you cannot improve it.

For many small UK businesses, a sensible pairing is a well-maintained Google Business Profile plus one active channel — a fortnightly email to your list, a local Facebook group you genuinely contribute to, or straightforward search advertising on the two or three phrases customers actually type. Whatever you choose, write it down along with what you are deliberately not doing this year. That second list protects your time.

Turn the Plan Into a Weekly Rhythm

A plan only becomes real when it has a slot in your week. Block out ninety minutes, ideally the same time each week, and treat it as a standing appointment. In that slot you might write next month's email, schedule two weeks of posts, follow up on outstanding quotes, or check your ad spend.

Work with the British calendar rather than against it. January brings enquiries about new starts; the run-up to Christmas is golden for retail and hospitality; August is quiet for B2B and busy for tourism. Note the two or three seasonal peaks that matter in your trade and prepare for them six weeks ahead, not six days.

Review Monthly, Reset Quarterly

Once a month, spend twenty minutes with these four questions:

• How many enquiries did we get?
• Where did they come from?
• What did each channel cost us per enquiry?
• What are we going to stop doing?

That last question is the important one. Every quarter, cut one thing that is not earning its place — a directory listing nobody uses, a social platform that brings nothing, a leaflet drop that never paid for itself. Dropping something frees up budget and attention for whatever is working.

Keep It Short Enough to Actually Use

Your finished plan should fit on one side of A4: the three numbers, the monthly budget, your two channels, the weekly slot, and the review date. Stick it somewhere you will see it — above the desk, inside the diary, on the wall of the workshop.

And build in a minimum version for the weeks when everything goes wrong. If you are snowed under with work, the fallback might simply be replying to every enquiry within four hours and posting once. A plan that bends under pressure is worth ten that snap. Review it monthly, adjust it honestly, and it will keep earning its keep long after the initial enthusiasm wears off.