I am not sure it's about reflectors to be honest. They've been peddling them here since I was a kid and I see them fairly often in the midlands and in London though can't speak for Scotland because I'm not there. I think it's more of a political issue now than it ever has been as well, because of the sensitivities around the union and Scotland's place in it that have been woken up more since the Independence referendum. There are arguments for and against adopting European time or doing away with GMT or BST and they're complicated, but the key factor for me is safety.
I personally hate reverting to GMT, but as I said before, if it prevents accidents, in the absence of a better plan, I can live with it. As we're leaving the EU, I suspect that we won't be dropping the change either. Not that the UK has ever really done what the EU tells it in any of these kind of sweeping policies, but that's kind of beside the point.
In any case, it's much more complex politically here than just 'wear reflectors'. And my personal view is that we're a divided enough country already since the Brexit vote. We don't need to reopen more rifts by causing more inconvenience to some parts of the UK than others...