Last time i used them was about 2 maybe 3 years ago. Used them twice in the space of a couple of months.
First girl was fantastic, great time had, and stayed the full hour (or as close to an hour as these girls get)!
The second, I asked for english and got EE, pretty lame effort for about 25 minutes, then the driver phoned, she got up, got dressed and ran off! Phoned the agency about this straight away, and got offer £20 off my next booking! Suffice to say, I never used it!