Complaint Evidence Checklist
Strong evidence can make or break a complaint. Before you escalate to an ombudsman or regulator, make sure you have gathered everything you need.
Communication records
Financial evidence
Supporting evidence
Helpful organisations
Financial Ombudsman Service
OmbudsmanResolves complaints between consumers and financial businesses such as banks, insurers, and lenders.
Energy Ombudsman
OmbudsmanResolves complaints between energy consumers and suppliers, including gas and electricity companies.
Citizens Advice
CharityProvides free, confidential, and independent advice on a wide range of issues including benefits, housing, debt, and employment.
Related guides
Building Your Complaint Evidence
A well-evidenced complaint is far more likely to succeed. Whether you are complaining to a financial firm, an energy supplier, the NHS, or a local council, the quality of your evidence determines how seriously your complaint will be taken — and how quickly it will be resolved.
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Making a formal complaint can feel daunting, but a well-structured complaint significantly increases your chances of a satisfactory outcome. In the UK, most businesses and public bodies are required to have a complaints procedure, and following the right process gives you access to independent resolution if things go wrong.
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When and How to Escalate a Complaint
If a company has failed to resolve your complaint satisfactorily, or if it has gone beyond the response deadline, you have the right to escalate. Escalation means taking your complaint to an independent body — such as an ombudsman, regulator, or the courts — who can investigate and enforce a resolution.
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What Is a Deadlock Letter
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