Sorry I just remembered there is more than one kind of A-Level in the UK. I'm from New Zealand where they only offer CIE. So yeah, CIE International A-Levels.
Yeah. the only impression you give to the admission tutors is something like, "oh, this kid is doing harder a-levels", but that does not give you any particular advantages over your university application. There really isn't any point in doing something harder, except it prepares you (better) for university.