Are you reading the same report as me? This guy was clearly flying on his FAA license during both crashes. The report clearly says "If the aircraft had been operated on the UK register, he would have been required to undertake training and a test to obtain a type rating." Ergo, the UK CAA could not have taken action against his UK license; but the FAA should have against theirs. How many times has this joker have to try to kill people before the Feds take action? As I said, out of sight, out of mind.
FGK,
As mentioned, you clearly don't understand the rules. This crash involved someone who was actually exercising the privileges of their CAA license, using an FAA validation to fly an N reg, in the belief that it exempted them from needing a type rating. If someone is going to fly illegally, whether on an FAA or CAA licence then you can't do much about that. The CAA had every responsibility to pull him up on the first instance for flying illegally.
There have been G reg "incidents" in the USA which have been investigated by the FAA - BA 747 from LAX on 3 engines for example. Of course you can own a G reg in the USA, but who in their right mind would? Who would carry out the annual?