It's fun to reflect that if this debate was concerning N-reg planes, we would be looking at an immediate ban on all flights
Some of the worst aircraft that I have been offered on rental were N Reg.
However, they were USA based.
The CAA and DfT have the mandate to legislate and require compliance. Some people have had a good few years taking advantage of FAA licensing in the UK and nothing lasts forever.
Now remind me, how many G-Reg aricraft are operated in the USA?