Hi All
Thanks for the all the comments.
I do not intend to mix and match.
Yes I am up to date and current, and intend to stay that way - it was a question posed because I forgot my passport. (no I wasn't going abroad)
It would be unusual to have to use the full FAA Privileges in the UK in GA, due to the height and complexity of the airways, along with . I hold an IMC - the only use in UK is lower MDA / DH.
Yes I have the FCC as well. How many FAA pilots in UK don't (me thinks a few)