Need to write a formal complaint? Our free formal letter of complaint template and 2026 guide for the UK will help you get the results you deserve.
Free Formal Letter of Complaint Template That Gets Results (2026 UK Guide)
A formal letter of complaint is the most effective way to resolve a dispute. It's professional. It's on record. And it gets results.
This guide gives you a free template and explains how to use it.
What Is a Formal Letter of Complaint?
It's a written complaint that:
- Follows a professional format
- Cites the relevant UK law
- Sets a clear deadline for response
- Can be used as evidence if you escalate
It's not aggressive. It's assertive. There's a difference.
The Free Template
[Your Name] [Your Address] [Your Email] [Date]
[Company Name] [Company Address]
Subject: Formal Letter of Complaint — [Issue] — [Reference Number]
Dear [Name or "Sir/Madam"],
I am writing to make a formal complaint about [describe the issue].
What happened: On [date], [describe what went wrong — be specific and factual].
The impact: This caused me [describe the impact — financial loss, distress, inconvenience].
My legal rights: Under the [relevant Act], I am entitled to [state your right]. You have not met this obligation.
What I am requesting: I require [state your desired outcome — refund, repair, replacement, apology] within 14 days.
If I do not receive a satisfactory response, I will escalate to [relevant ombudsman or Trading Standards].
Yours sincerely, [Your Name]
Enc: [List enclosed documents]
Key Laws to Cite
Consumer Rights Act 2015 Use this for faulty goods or poor services. It gives you the right to a repair, replacement, or refund.
Financial Services Act 2012 Use this for banking, insurance, or investment complaints.
Housing Act 2004 Use this for landlord disputes — deposits, repairs, or unsafe conditions.
Energy Act 2013 Use this for energy billing disputes or poor service from your supplier.
NHS Constitution Use this for healthcare complaints — misdiagnosis, poor treatment, or cancelled appointments.
How to Send It
Always send by recorded delivery. This proves the company received it.
Email is fine too. But post a copy as well. It removes any doubt.
If They Don't Respond
Give them 14 days. If they don't respond:
- Escalate to the ombudsman. Most services have a free, independent ombudsman.
- Contact Citizens Advice. They offer free, impartial advice.
- Use the small claims court. For amounts up to £10,000, this is straightforward and affordable.
Companies know this. Most settle before it gets that far.
Why LetterForce Works
Most people don't know which law to cite. Or how to phrase their complaint. Or what outcome to ask for.
LetterForce solves all of this. Just describe your complaint. Our AI writes a professional letter that cites the right law and uses the right tone.
Your first letter is free. No card required.
Summary
A formal letter of complaint is your most powerful consumer tool. Use the template above. Be specific. Cite the law. Give a deadline.
Or let LetterForce write it for you — free. Most companies respond within 14 days.
Ready to Write Your Letter?
LetterForce generates professional, legally-sound complaint letters in minutes — backed by UK consumer law.