Apparently there isn't one. I know that it is possible for one to come from Germany (I think)but it is very expensive. I have looked into this myself. The advice is to go to the States. There are organizations that can do all the training here but the testing is done in the States.
To be certain give Julia a ring at American Aviation Services (Gloucester Airport)a ring (01452)857757 or goto the web site
www.faa.co.uk and contact them through there. They will be very helpful but I don't think they will recommend. Thats up to you. Hope this helps.