Union Detriment Grievance Letter: Free Template and What to Include

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.

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.

[Your Name]
[Your Address]
[Your Postcode]
[Your Phone Number]
[Your Email Address]
[Name of HR Manager / Senior Manager]
[Job Title]
[Company Name]
[Company Address]
[Company Postcode]
[Date]

Dear [Name],

Subject: Formal grievance – detriment because of union membership or activities

I am raising a formal grievance. I believe I have been treated unfairly because of my membership of [Name of Union] and my union activities. This is unlawful under section 146 of the Trade Union and Labour Relations (Consolidation) Act 1992.

What has happened:
• [Date]: [e.g. I was refused a promotion despite meeting all the criteria.]
• [Date]: [e.g. my manager criticised my attendance at union meetings in my appraisal.]
• [Any other incidents, with dates.]

I have the right to take part in union activities at an appropriate time (outside working hours, or during them with your agreement) without being penalised.

Please hold a formal grievance meeting within 5 working days. I will be accompanied by [a union representative / a colleague].

If this is not resolved, I may bring an employment tribunal claim.

Yours sincerely,

[Your Signature]
[Your Printed Name]