A and C, eckhard..
You may well be right as to the practicalities, I don't follow GA that closely but am well aware of the controversy ( to put it mildly) about the Sala accident.
I'm aware that the following points were raised by opposition politicians, but nevertheless IMHO they are valid observations:
Liberal Democrat MP Sarah Olney, the party's transport spokesperson, said, “The transport secretary must make public the justification for registering his plane in the U.S. versus the U.K. The registration throws up a multitude of concerns and begs the question why anyone should register their vehicle in the U.K. if it’s not good enough for the government.”
Labour MP Grahame Morris, who sits on the parliament's transport committee, also raised similar concerns. “Mr. Shapps should not set the rules for the U.K. to then opt out of the requirements by registering his own private plane under the light-touch regulatory regime of the U.S.," he said.