..actually, further to what I wrote above there's eight Trainee Driver Jobs appeared at Kings Cross for FCC (or what will become the Thameslink, Southern & Great Northern Franchise). Since you're in London this is a viable possibility.
Link here...
FCC Kings Cross Trainee Driver Jobs
Worth a go if you're still looking around for a place to take you. Currently a good company to work for - with good conditions.
BW
NB CLOSING DATE IS THURSDAY 27th - SO YOU NEED TO HURRY IF YOU WANT TO FOLLOW THIS UP !