Microsoft 365 Copilot for a UK small business: cost, prerequisites and whether it is worth it.

Microsoft prices Copilot in pounds, which makes it the easiest of the AI tools for a UK firm to budget. Microsoft 365 Copilot Business is £16.10 a user a month on an annual commitment for organisations under 300 users, following a promotional £13.80 that ran to the end of March 2026. It is an add-on: it sits on top of Business Basic at £4.60, Business Standard at £9.60 or Business Premium, and cannot be bought alone. The full Microsoft 365 Copilot licence, used with E3 and E5 and by larger firms, is listed at about £23 to £30 a user a month depending on channel and term.

So a ten-person firm on Business Standard pays about £96 a month for Microsoft 365 and about £161 a month for Copilot on top, about £3,080 a year in total, ex VAT. For comparison, ten seats of Claude Team or ChatGPT Business are about £1,810 a year, and the two are not exclusive.

Microsoft UK list prices as published in 2026. Confirm the current figure with your cloud solution provider, as Microsoft adjusts UK prices periodically.

Three technical prerequisites: an Exchange Online mailbox, a Microsoft Entra ID account for each user, and the cloud versions of the Microsoft 365 apps. Most firms on a Business plan already have all three. The prerequisites that actually decide whether the licence pays back are organisational. Copilot shows people whatever SharePoint and OneDrive already let them see, so a tenancy with years of over-shared folders reveals that on day one, and a permissions review belongs before the rollout. If the firm’s real work lives in a line-of-business system, a file server or personal desktops rather than SharePoint, Copilot has little to read and its value shrinks to email and meetings. And meeting recaps need transcription switched on in Teams, which is a policy decision some firms have not taken.

Your IT provider can do all three in a week. Make them a condition of the order rather than a follow-up.

The value is the plumbing, not the model. Copilot reads what Microsoft Graph knows about the user: their mailbox, calendar, Teams meetings and the SharePoint files they can see. Ask it what was agreed with a client last month and it finds the thread, the meeting transcript and the proposal without anyone uploading anything. Meeting recaps in Teams alone justify the licence for people who spend their day in calls. It drafts in Word and Outlook from your own documents, summarises long threads, and answers questions about spreadsheets in Excel. For the desk-bound half of a firm this is most of the day.

It also inherits Microsoft’s tenancy: data stays inside the Microsoft 365 boundary in the tenancy’s region, normally the UK data centres for a UK firm, Microsoft’s commitment not to train on customer content applies, and existing conditional-access and retention policies cover it. For a client contract that requires UK processing, it is the only one of the three tools that satisfies it without a development project.

The most common complaint from firms that rolled out Copilot alone is that it is excellent at finding things and mediocre at writing them, and that staff drift back to a personal ChatGPT account for anything hard, which is the data-protection outcome the purchase was meant to prevent. Across independent comparisons and our own use, the models behind Claude and ChatGPT produce better long-form writing, analysis and code. The fix is not to abandon Copilot but to buy the other tool for the people who need it: Claude Team, with its Microsoft 365 extension inside Word and Outlook, for the fee earners and analysts, or ChatGPT Business for the marketers.

Every Microsoft 365 business subscription includes Copilot Chat: a web-grounded assistant, signed in with the work account, with enterprise data protection that keeps prompts out of training and inside Microsoft’s terms. It does not read your mailbox or files and does not sit inside the apps, but it is a safe general assistant that costs nothing, and it is the cheapest way to get staff off personal ChatGPT accounts. Switch it on, tell people it exists, and put it in the acceptable-use policy as an approved tool. For a firm whose staff mostly want a safe general assistant, Copilot Chat plus a handful of paid seats for the heavy users may be the whole answer.

Give five people the paid Copilot licence and five people Claude or ChatGPT for a month, matched by role, with the same ten real tasks from your own work: a client thread to summarise, a proposal to draft, a spreadsheet to interrogate, a meeting to recap, a policy to rewrite. Score the output blind. Then buy on the scores and on the licences you already hold. The exercise costs a few hundred pounds and settles a decision most firms otherwise argue about for a year.