How to Complain Effectively in the UK

Before submitting a formal complaint, gather all relevant evidence. This includes contracts, receipts, bank statements, screenshots of communications, and any relevant dates. The stronger your paper trail, the harder it is for a company to dismiss your complaint.

Identify exactly what went wrong, the specific impact it had on you (financial loss, inconvenience, distress), and what outcome you want. Be realistic: you are more likely to succeed with a specific request — a refund, an apology, or a repair — than a vague demand for "better service".

Check the organisation's published complaints procedure, which is usually on their website. Many companies have a dedicated complaints team or email address. Using the correct channel ensures your complaint is logged properly and responses are tracked against regulatory deadlines.

A well-written complaint is clear, factual, and professional. Avoid emotional language or personal attacks — stick to what happened, when it happened, and what you want done about it.

• Opening: State clearly that you are making a formal complaint and reference your account number or reference if relevant.
• The facts: Set out events in chronological order with specific dates and amounts where possible.
• The impact: Explain how the issue has affected you — financial loss, time wasted, health impact, or significant inconvenience.
• Your request: State clearly what outcome you want, such as a refund, compensation, repair, or written apology.
• Deadline: Give the organisation a reasonable deadline to respond — typically 14 days for a simple issue, 28 days for something complex.

Send your complaint by email where possible so you have a time-stamped record. If you must write by post, use recorded delivery.

If you do not receive an acknowledgement within a few working days, follow up and confirm your complaint was received. Keep a log of every contact you make — the date, the name of the person you spoke to, and what was said.

If the organisation fails to respond within the time limit set out in its complaints procedure (or 8 weeks as a general rule), this may count as a deadlock and allow you to escalate to an ombudsman. You do not always need to wait for the full 8 weeks — if the company sends you a final response letter earlier, you can escalate immediately.

Be persistent but polite. Escalate within the organisation if your first contact does not help — ask for the complaint to be reviewed by a manager or the company's dedicated complaints team. Document every step, as this record will be valuable if you need to go to an ombudsman.

If the organisation rejects your complaint or you are unhappy with their final response, you have further options depending on the type of organisation involved:

• Financial services: Refer to the Financial Ombudsman Service (FOS) within 6 months of a final response letter.
• Energy suppliers: Refer to the Energy Ombudsman after 8 weeks or upon receiving a deadlock letter.
• Telecoms: Refer to an Ofcom-approved ADR scheme (CISAS or Ombudsman Services: Communications).
• NHS: Escalate to the Parliamentary and Health Service Ombudsman (PHSO) after going through the NHS complaints process.
• Local councils: Refer to the Local Government and Social Care Ombudsman (LGSCO).
• Goods and services: Consider the small claims court (up to £10,000 in England and Wales) for direct financial loss.

Citizens Advice can help you identify the right route and assist you in making your case at no cost.