Decent agencies for driving jobs in London or surrounds?

Passed my test (C) last year, but came straight out to europe and been working over here ever since.
Im coming back to England in a week or so now, and wanna get some work asap. Its a bit up in the air what I’ll be doing long term, so thinking about agency work, but no idea about agencies back there- who’s worth calling to get something sorted?
London or anywhere an hour or so outside would be fine for me