Hi ANika!
I am moving to London in October and jsut obtained a position as a social worker with Bexley Council. This is the agency I used:
http://www.bbtjobs-care.co.uk/ They have an office on Toronto as well and I interviewed via video conference.
They have temp positions as well. Hope that helps and if you want to email me at yahoo or msn with questions, please do.
Perhaps I'll see you in London!
Lori