Knowing how to complain in the UK is often less about writing an angry message and more about following the right sequence. This practical checklist explains how to gather evidence, make an effective complaint, escalate it to an ombudsman or regulator, protect important deadlines and pursue an appropriate remedy.
Overview
A complaint is a formal opportunity to explain what went wrong, what impact it had and what outcome you want. It can concern a retailer, bank, insurer, broadband provider, builder, landlord, employer or public service. The route depends on the organisation, the type of dispute and which part of the UK is involved.
Before contacting anyone, identify whether you are seeking a customer-service resolution, exercising a legal right or preparing for a possible claim. These are related but not identical. For example, a request for a faulty product to be repaired may be a consumer-rights issue, while a complaint about poor communication may be handled under the provider's internal complaints procedure.
A reliable complaint pathway is:
- Define the problem and the outcome you want.
- Collect documents, dates and other evidence.
- Try the appropriate informal route if this is sensible.
- Send a clear formal complaint through the stated procedure.
- Allow the organisation a reasonable opportunity to respond.
- Escalate to the relevant ombudsman, regulator or dispute scheme where available.
- Consider a pre-action letter or legal advice if the dispute remains unresolved.
Do not assume that an ombudsman, regulator or court performs the same function. An ombudsman may review a complaint and recommend or require a remedy under its scheme rules. A regulator may record concerns or investigate wider compliance without recovering your individual loss. A court decides a legal claim, subject to the relevant rules, evidence and time limits.
Checklist by scenario
Retail purchases, services and refunds
- Keep the receipt, order confirmation, contract, warranty information and payment record.
- Describe the defect, delay, cancellation or failure to provide the service in precise terms.
- Explain whether you want a repair, replacement, repeat performance, price reduction or refund. The appropriate remedy can depend on the facts and the applicable contract law.
- Give the trader a reasonable response period and state what you will do next if the issue is not resolved.
- For card or finance payments, check whether a Section 75 claim or chargeback route may be relevant. These have different conditions and are not automatic substitutes for a complaint to the trader.
For background on repairs, refunds and faulty goods, see our Consumer Rights Act UK guide. Faulty vehicle disputes may require a different approach; our car dealer complaints guide covers rejection and refund issues in more detail.
Banks, insurers, broadband and other financial or regulated services
- Use the provider's official complaints channel, not only a general sales or support inbox.
- Record the complaint reference, the date submitted and the name or team handling it.
- Ask for a final response if the provider says it cannot resolve the issue.
- Check which ombudsman or dispute-resolution scheme covers the service and whether its eligibility and time limits apply.
- Continue making undisputed payments where appropriate, while clearly disputing the amount or service you say is wrong.
An formal complaint letter template can help organise the facts. The correct escalation route varies between services, so check the provider's complaints information and the relevant scheme before sending an escalation.
Landlords, letting agents and housing repairs
- Report repairs in writing and describe any safety, health or access concern.
- Include photographs, inspection reports, contractor visits and copies of earlier reports.
- Ask for a repair plan, expected dates and the name of the person responsible.
- Use the landlord's or agent's formal complaints process if informal reports do not resolve the issue.
- Check whether the landlord belongs to an approved redress scheme or whether a council, housing ombudsman or other local route applies.
Housing law and complaint routes differ across the UK. Avoid withholding rent or taking other unilateral steps without understanding the legal consequences. See the guides on landlord complaints, letting agents and council housing repairs.
Employment and workplace disputes
- Check the contract, workplace policy and any grievance procedure.
- Set out the events in date order, including witnesses and documents.
- State whether the issue concerns pay, discrimination, bullying, working conditions, dismissal or another workplace matter.
- Use the formal grievance process where informal discussion has not worked or the issue is serious.
- Check employment tribunal and early-conciliation deadlines promptly; making an internal complaint does not necessarily stop the clock.
For unpaid wages or holiday pay, see our claims guide. If dismissal is involved, contact ACAS or obtain specialist advice promptly. The ACAS Early Conciliation guide explains the general process and why timing matters.
Privacy and personal data
- Identify the organisation, the data involved and the specific concern.
- Consider whether you need a subject access request, correction, deletion or an explanation of processing rather than a general complaint.
- Keep copies of requests and responses.
- Complain to the organisation first where appropriate, then consider the Information Commissioner's Office route if the issue remains unresolved.
A GDPR complaint may address data handling, while a subject access request is a specific data-rights request. Do not combine unrelated issues so broadly that the organisation cannot identify what action you are asking it to take.
What to double-check before escalating
Read the organisation's complaints procedure carefully. It may require a particular form, department, reference number or two-stage process. Keep proof of submission, such as an email copy, online confirmation or recorded delivery receipt.
Check the remedy you are requesting. A complaint should distinguish between direct financial loss, inconvenience, distress, damaged property and the correction of an account or record. Explain how you calculated any sum claimed and attach supporting evidence. A realistic, clearly justified request is easier to assess than a broad demand for compensation.
Check jurisdiction and deadlines. Consumer, housing and employment rules can differ between England and Wales, Scotland, and Northern Ireland. Ombudsman schemes also have their own eligibility requirements and time limits. Court claims have limitation periods that depend on the type of claim, and a complaint to a business or regulator may not extend them.
Finally, check whether accepting a proposed settlement could end the dispute. Read any wording about full and final settlement before agreeing.
Common mistakes
- Writing a long narrative without a request: use headings or a short timeline, then state the remedy sought.
- Relying on telephone conversations: follow up with an email recording what was said and agreed.
- Making unsupported legal threats: identify the relevant contract term or legal issue only where you understand it, and avoid claiming that an agency can order a remedy when it cannot.
- Escalating too early: an ombudsman or regulator may require you to complete the organisation's internal process first.
- Missing a deadline while negotiating: diarise limitation, appeal, cancellation and escalation dates separately.
- Sending evidence in an unusable format: name files clearly and refer to each attachment in the complaint.
- Continuing an unsafe situation: urgent risks involving housing, health, fraud or personal safety may require immediate contact with the appropriate emergency or public authority route, not merely a standard complaint.
When to revisit this checklist
Return to this guide whenever the dispute changes stage: before making the first formal complaint, after receiving a final response, before contacting an ombudsman or regulator, and before sending a letter before action. Recheck the relevant organisation's current procedure, scheme rules and deadlines because routes and online forms can change.
At each stage, update a simple case file containing the timeline, evidence, complaint reference, responses, deadlines and next action. If the issue involves a substantial sum, possible court proceedings, discrimination, eviction, dismissal or a limitation deadline, consider obtaining independent legal advice. A complaint can be an effective first step, but it should not replace urgent advice where your legal position may be at risk.
Final action list: write down the outcome you want, gather the evidence, submit the complaint through the correct channel, diarise the response date, request a final response where needed and escalate only through a route that covers your dispute.
