UK Workplace Issue Playbook · 2026
How do I claim unfair dismissal in the UK?
Why this matters
Unfair dismissal claims are the most common UK employment tribunal claim. Awards include basic award (similar to redundancy pay calculation), compensatory award (capped at lower of £105,707 or 52 weeks' actual pay — April 2024 cap), and where applicable additional/aggravated awards. Median tribunal awards 2024-25 were around £8,000-£15,000 but high-profile cases reach £100,000+.
Legal basis
Employment Rights Act 1996 ss.94-98; ACAS Code of Practice; tribunal jurisdiction under Employment Tribunals Act 1996; cap rates set annually April.
Step-by-step playbook
1) Confirm 2+ years' continuous service (or that the dismissal is automatically unfair). 2) Get the dismissal in writing with reasons (statutory right to written reasons within 14 days). 3) Use the internal appeal procedure — failure to appeal can reduce any award by 25%. 4) Calculate your loss: notice pay, salary to find new job (typically 6-12 months), pension loss, holiday, any benefits lost. 5) File ACAS Early Conciliation within 3 months less 1 day of dismissal. ACAS pauses the time limit during conciliation. 6) Many cases settle at ACAS stage — 50% of UK ET claims settle pre-tribunal. 7) If no settlement, file ET1 form with the tribunal. 8) Disclosure, witness statements, hearing. 9) Consider engaging an employment lawyer (no-win-no-fee available for many cases). 10) Prepare for 6-18 month timeline to final hearing.
Letter / template
ACAS Early Conciliation triggering template (after getting written dismissal reasons): 'Dear [HR], Further to my dismissal on [date], I am notifying you that I have filed for ACAS Early Conciliation under reference number [X], a prerequisite to bringing an employment tribunal claim. The basis of my potential claim is unfair dismissal under the Employment Rights Act 1996 ss.94-98. My concerns include: - [Procedural failures: e.g., no proper investigation, predetermined outcome, denied right to appeal, biased investigator] - [Substantive failures: e.g., the dismissal was not within the band of reasonable responses, comparator treated more leniently, no consideration of mitigation] - [Automatic unfair dismissal: if applicable — whistleblowing s.103A, pregnancy s.99, trade union, asserting statutory right] I estimate my financial loss as: notice pay £[X], compensatory award £[Y] (calculated as [N] months' pay during job search), pension loss £[Z], total £[Total]. I am open to settlement discussions through ACAS. My preferred resolution: financial settlement covering [components] plus an agreed reference. If no settlement is reached, I will issue tribunal proceedings. Yours sincerely, [Your name]'
What NOT to do
Don't: miss the 3-month time limit (some judges grant extensions, most don't); skip ACAS Early Conciliation (it's mandatory); pursue tribunal without legal advice for complex cases; fail to mitigate loss (you must look for new work — keep evidence of applications); inflate your loss claim implausibly; refuse all settlement offers (judges expect reasonable engagement); represent yourself if the case is complex (legal costs are NOT recoverable in tribunals — but neither is your time).
Worked example
James (4 years' service) was dismissed for 'misconduct' after raising concerns about safety. The disciplinary process had no investigation, no formal hearing, and immediate dismissal. He filed ACAS conciliation citing both unfair dismissal AND automatic unfair dismissal under whistleblowing (s.103A). ACAS facilitated settlement at £42,000 + agreed reference within 6 weeks. Without the ACAS step, employer would have insisted he go to tribunal where they could try to defend procedurally — the threat alone got the settlement.
Recruiter pro tip
ACAS Early Conciliation is your single most valuable tool. It's free, takes 6 weeks max, and 50% of UK employment claims settle at this stage. Use it to put your settlement number on the table backed by a clear legal framework. Most UK employers settle at ACAS to avoid the time, cost, and PR risk of tribunal — your job is to make the conciliation period feel like the cheapest exit. Detailed loss calculations + clear legal grounds = leverage.
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