How to Write a Cover Letter UK — Complete Guide 2026

A great cover letter can be the difference between getting an interview and being overlooked — even when your CV is strong. Yet most applicants write generic, forgettable letters that tell hiring managers nothing they couldn't read on the CV. This guide shows you exactly how to write a cover letter in the UK that actually gets results.

How Long Should a Cover Letter Be UK?

The ideal cover letter length in the UK is 3–4 paragraphs, fitting comfortably on one A4 page. Most recruiters spend less than 30 seconds on a cover letter — so every word must earn its place. Aim for 250–400 words maximum.

Cover Letter Structure UK — The Four Paragraphs

1. Opening paragraph: Why you are applying for this specific role at this specific company. Show you have done your research. Never start with "I am applying for..."
2. What you bring: Your most relevant skills, experience or achievements — not a repeat of your CV, but the highlights most relevant to this role
3. Why this company: Show you understand their mission, values or recent developments. This separates genuine applicants from bulk-appliers
4. Closing paragraph: Reiterate your enthusiasm, invite them to read your CV, and end with a clear call to action

What to Include in a Cover Letter UK

• Your name and contact details at the top
• The date and the employer's details
• The specific job title you are applying for
• Why you want this role (genuine motivation)
• Your most relevant skills and achievements
• Why you want to work for this company specifically
• A professional sign-off

Cover Letter Mistakes to Avoid

• Generic opening: "I am writing to apply for..." — start with something compelling instead
• Repeating your CV: Your cover letter should complement your CV, not duplicate it
• No research: Not mentioning anything specific about the company shows lack of genuine interest
• Too long: More than one page almost always hurts rather than helps
• Wrong tone for the company: A startup cover letter should read differently to an application to a law firm
• Spelling and grammar errors: Fatal in any professional context

Should I Use AI to Write My Cover Letter?

Using AI tools like Doxly to generate a cover letter is fine — provided you personalise it with genuine details, specific examples from your experience, and real reasons why you want the role. AI-generated letters that aren't personalised are as obvious to recruiters as generic templates. Use AI to get the structure right, then make it yours.