Anyone know any good recruitment agencies that are actually worth the effort?

I started my job in November and love it! It's working in London city, working for a big medical research company run by the goverent. However my boss is a total twat, she does no work, surfs the net all day and basically doesn't give a shit! She's meant to be training me up but Instead she expects me to do most of the work!

Short of cracking her over the head with anything heavy that comes to hand I have tried every thing!
So I think the next best thing is to look at new jobs!!

So any agencies or sites people recommend?
I live in south cambs and commute, don't mind travelling a little way but not hndreds of miles!!

Thanks xx