Thanks for the reply.
I should have clarified, I understand I can fly commercially on any N-reg (and M-reg) anywhere in the world. However, I am assuming that most clubs have G-reg craft.
Will a CAA IMC based on my FAA IR allow me to fly IFR in G-reg planes? How would I go about getting my IR validated?
I assume my FAA Commercial is equally valid in singles and multis? The main obstacle to renting a Twinstar (or whatever) is going to be insurance requirements, is this correct? I understand you JAA boys have types on your licence (eg DA42, PA34) whilst the FAA doesn't go in for that malarky, is this going to be an issue?