Can I claim compensation from my employer for being bullied by my co-workers?

[Khalid]

I am being bullied at work by colleagues and my employer does nothing.
Over time I have made at least 6 complaints about same person and nothing done, I have started to look for new work as its making me very unhappy.

I have already been signed off work for 4 weeks by my doctor after going to my GP with anxiety and depression, how much compensation could I be entitled to?