It looks (to me) to be a simpler install than running 3C+E all over the
house.

I have the Screwfix ones with battery bases which are supposed to link by
radio, only they don't, even when close together (and yes, trying all
combinations of band switches). However although I know I should, I can't be
a*sed to complain because it's the only problem I have ever had with
Screwfix. Has anyone else had better luck?