UK Trademark Basics: What Most Business Owners Get Wrong

TL;DR

• A Companies House registration gives you zero trademark rights — they’re completely separate systems
• UK trademark law is first-to-file, not first-to-use
• You need to search for similar-sounding names, not just exact matches
• Post-Brexit: EU trademarks no longer cover Great Britain — you may need a separate UK filing
• Check if your name is clear on the UK trademark register before you build around it

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Let’s start with the most common misconception.

Registering your company at Companies House does not protect your brand name. It never has. Companies House and the UK trademark register are completely separate systems, run by different bodies, for different purposes. You can have a company name registered at Companies House while someone else holds the trademark. Both are perfectly legal.

That surprises a lot of people. It probably shouldn’t — but it does.

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What a Trademark Actually Does

A UK trademark, registered through the Intellectual Property Office, gives you exclusive rights to use a name, logo, or slogan in connection with specific goods or services across the UK. That exclusivity is the thing that matters.

Without it, you’re relying on “passing off” — a common law principle that protects unregistered brands that have built up significant goodwill. Passing off claims can win. They’re also expensive to bring, hard to prove, and limited to the geographic areas where you can demonstrate you’re known.

A registered trademark is cleaner. It’s a public record of ownership. It deters conflicts before they start. And it’s far cheaper to enforce than a passing off claim.

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The Search Step Everyone Gets Wrong

Before you file, you need to know whether the name is actually available. This is where businesses make expensive mistakes.

The obvious check is looking for your exact name in the IPO database. If nothing comes up, most people assume they’re clear. They’re not.

The IPO assesses trademark conflicts on several dimensions:

Visual similarity — names that look alike on a page can create confusion even when they’re not identical.

Phonetic similarity — how does it sound when spoken aloud? This matters for anything that’s said in conversation, on radio, in customer service. “Claritex” and “Claritix” are a problem.

Conceptual similarity — do two names convey the same idea? “Speedy” and “Swift” in the same industry could be an issue even though the words are different.

Class proximity — trademarks are filed in categories (classes) that correspond to types of goods and services. A conflict in the same or adjacent class carries much more weight than one in a completely unrelated industry.

A UK trademark registration search that covers all of these — not just exact matches — is what actually tells you whether a name is safe to build around.

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The Brexit Wrinkle Many Businesses Missed

If your business has been operating under EU trademark protection, pay attention to this.

When the UK left the EU trademark system on 1 January 2021, EU trademarks stopped automatically applying in Great Britain. The UK IPO created equivalent UK marks for existing EU registrations — but new EU filings made after that date don’t cover the UK.

This means two things:

1. If you filed an EU trademark before Brexit and assumed it covered the UK, check whether a UK equivalent was actually created.
2. If you’re filing new trademark applications now, an EUTM filing doesn’t give you UK protection. You need a separate UK application.

A lot of businesses — particularly those that expanded into the UK market from Europe — are operating with less protection than they think.

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Common Mistakes, Briefly

Filing too late. UK trademark law is first-to-file. The longer you wait, the more time you give others — including bad-faith actors who monitor growing brands and file ahead of legitimate owners.

Registering in too few classes. File in the classes relevant to what you do now and what you’re likely to do in the next few years. Expanding into adjacent areas later becomes harder if someone else has registered your name there.

Not checking pending applications. An application filed last month might not be registered yet — but it can still block yours once it is. Pending filings need to be part of your search.

Thinking a domain or social media handle is enough. Neither gives you trademark rights. You can own a domain and have someone else own the trademark — and they’d have the stronger legal position.

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The Practical Checklist

• Search the IPO database for identical and similar marks in your categories
• Check pending applications, not just registered marks
• Consider whether any names are phonetically or conceptually similar to yours
• If you have EU trademark coverage, verify whether UK equivalents exist
• File your UK trademark application early — the process typically takes 4–6 months for straightforward cases
• After registration, set up monitoring for similar new applications so you can oppose within the 2-month window

The official filing fee starts at £170 for one class online. Not expensive relative to what a conflict costs to resolve.

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There’s a pattern worth noticing: the businesses that end up in trademark disputes almost always knew they should have checked earlier. They just had other things to deal with.

The search takes an afternoon. The dispute takes months and costs far more.

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Demarka is an AI-powered trademark search tool for UK businesses. Run a quick search on a name before you build around it. It doesn’t replace a trademark attorney — but it tells you fast whether a name is worth pursuing.