Errr....correct me if I'm wrong, but theres this place in Norwich Airport that does them. They always advertise in 'Pilot' and those kinda mags. Forgot what they're called, but they pride themselves on being the only people in Europe to offer full FAA training. Read the advert this morning in 'Pilot' I think. And it said the written exams are done there too.
Oh yeah, and you can do them at the US Embassy in London too. Forgot to add that.
Thx.