How long do I have to bring an unfair dismissal claim?

Three months less one day from the effective date of termination. This is confirmed by ACAS. Internal appeals do not pause this deadline.

Do I need two years of service to claim?

For ordinary unfair dismissal, yes, though the qualifying period is being reduced. There is no minimum service for automatically unfair reasons such as whistleblowing, discrimination or asserting a statutory right.

Should I appeal even if I plan to bring a tribunal claim?

In most cases, yes. Not appealing can reduce any compensation awarded by the tribunal.

Dismissed from Work: What to Do Next in the UK

The most important thing to know after a dismissal is the deadline. A claim for unfair dismissal must be started within three months less one day from the effective date of termination. ACAS Early Conciliation must be completed before the claim is issued, and the internal appeal process does not stop the clock.