Sorry to be picky, but the Isle of Man and Channels Islands aren't part of the UK either.
Politically, IoW is part of England and so GB, albeit geographically a separate island.
Politically, IoW is part of England and so GB, albeit geographically a separate island.
I swear they're just messing with us. Who comes up with these things...
Skip to 5:00 for a beautiful diagram outlining the mess.