Is bullying illegal in the UK?

Not by itself. It becomes a legal claim where it engages the Equality Act as harassment linked to a protected characteristic, the Protection from Harassment Act, or a breach of the implied duty of trust and confidence.

How long do I have to bring a harassment claim?

Three months less one day from the last act of harassment, where the conduct is continuing. ACAS confirms the applicable time limits.

Do I have to raise a grievance first?

It is not a legal requirement, but it usually strengthens the claim and is expected under the Acas Code. Not raising one can also affect the compensation awarded.

Bullying and Harassment at Work: What to Do

Bullying is not a standalone legal claim in the UK, but harassment linked to a protected characteristic under the Equality Act 2010 is. So is harassment that amounts to a course of conduct under the Protection from Harassment Act 1997. Either way, documenting incidents early is what turns a difficult situation into a claim that can be defended.