"Wire nuts are not used in the UK because the old ceramic ones were banned many years ago for good reason"

I don't think they're any more solid, and there's a lot of talk that they weaken the connections over time / repeated use.

I've lived in houses (and worked in workplaces) with 40's and 50's wiring (and a couple of workplaces with literal 100-year-old wiring still in place, but unused) and things never came loose, just the opposite.