The top Uni's i.e the Russel Group ones (Manch, Oxf, Liv, Cardi etc) absolutely no.
For the red brick ones and the pre 1992 ones (e.g Sheff, Swan, Bang, Leed) they'd prefer A-levels but for some unpopular courses they will allow BTECs. This dropped in recent years to very few courses however with the £9k fees (and not as much going to Uni) this may change.
However what I have found is that they don't count them as A/A*. It's a bit like the con where a certain BTEC is worth twelve GCSE's - well common sense says that a BTEC isn't the same amount of work as twelve GCSE's does it?.
For the post 1992 Unis (e.g Manch Met, LJMU, UWIC etc) yes.