BigBusDriver
THe UK CAA upto last year did do an "extended" renewal if you had an ICAO class 1. I think that this could only be done at Gawick though as it was only really an initail minus a few points. It does not exist anymore however and an FAA class 1 medical is no more use to you than a peice of toilet paper as far as the UK CAA go.
Hope you can get sorted soon and this answers your questions.