For all the N-reg aircrafts based in the UK, they must have their US annual and service somehow performed in the UK. Does this mean that the service person has to have FAA A&P certification?
Anybody suitably qualified can do the work but the Annual has to be signed off by an A&P/IA. There are plenty of freelance IAs around. Should cost about £200.
Now flip this - let's say you have a G-reg aircraft in the US over the period of its annual. Can the annual be done in the US by an FAA A&P or do you have to have one with EASA certification? And if so, are there such that can sign off a FAA done job?
Again, anybody suitably qualified can do the work (which is fairly obvious if you poke your head into a randomly selected UK maintenance company, and see the "child labour" there
) but it has to be signed off by the right authority. I would think that getting a G-reg maintained fully in the USA would be a regular hassle.
This kind of stuff can be a hassle if you go on a flying holiday. On a private N-reg, there is more flexibility on the inter-Annual services than on a private G-reg (no 150hr for example) but you don't really want say 70 hours on your oil...