Thanks for the help on this guys. I have emailed the FAA about it but have, as yet, not recieved any feedback.
I noticed the nearest AME to me is 'FAA approved' according to the details on the CAA website, so I guess I could get both an FAA and CAA issued at the same time?
This probably sounds a daft question, but I presume it involves one medical but two sets of paperwork/fees?
The irony is I have a class 2 medical valid until later this year but I used the class 1 details on my validation form as I was unsure about the validity of the class 2 as I held a newer (but shorter-lived) class 1. I did try and get some details about this from the CAA at the time but got absolutely no joy.
Many thanks!