My DD's current school does and I am trying to find out if any other schools do.
It is a selective school but most students don't want to do 4 and parents spend time fighting the school to allow 1 to be dropped. Historically, student would have taken an AS at the end of Year 12 in one of the subjects and then carried 3 on to A level. But only a few subjects in the school can now be taken as an AS at the end of Year 12.