Union Detriment Grievance Letter Template & Generator
How to raise a grievance for being treated unfairly because of union membership or activities — what to say, your rights under UK law, and a free instant generator.
← All Letter Templates & Generators · Trade Union Rights · Last updated 18 August 2026 · Written and reviewed by Matt Thompson, founder of UK Work Rights
This is free rights guidance, not legal advice. For advice specific to your situation, see our About page or contact Citizens Advice.
If you need to raise a grievance for being treated unfairly because of union membership or activities, a written letter is the recommended first step — it creates a clear record and shows you're pursuing the matter formally. Below is what a strong union detriment grievance should include, plus a free tool to generate yours.
What this letter needs to cover
- Describe the specific detriment with dates and facts
- State this is unlawful under section 146
- Request a formal grievance hearing within 5 working days
- Warn of tribunal claim if not resolved
Your protection from detriment for union activities
Being subjected to any detriment — passed over for opportunities, treated less favourably, or otherwise disadvantaged — because of your union membership or activities is automatically unlawful, with no minimum length of service required for this protection to apply.
What to include before you send it
- A clear, factual account of the treatment you've experienced
- Confirmation of your union membership or specific activities involved
- Why you believe the treatment is connected to this
- What outcome you're seeking
Union "activities" cover more than just formal meetings
This protection extends beyond attending official union meetings — recruiting members, distributing union literature, or representing colleagues informally can all count as protected union activities, so detriment connected to any of these is worth raising if you believe it's occurred.
Frequently Asked Questions
Does this protection apply if I'm a union representative, not just an ordinary member?
Yes — representatives carrying out their union duties are protected in the same way, and in some respects have additional specific protections around facility time and training.
What compensation could I claim if successful?
There's no cap on compensation for detriment connected to trade union membership or activities if a tribunal claim succeeds, reflecting how seriously this protection is treated.
Ready to write yours?
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