1. 'Based' is a difficult concept for aircraft - they move about! In terms of flight operations I think you'll find that the CAA regulates those that operate under a UK AOC. It's a while since I had anything to do with the topic but with JAR-OPS etc. I think State of registration becomes less of an issue.
2. Probably because you're covered by the Civil Aviation (Working Time) Regulations 2004 which have different limits and arrangements.
3. Mine tells me he's kn@ckered too - and we both work on the ground!