Warwick WERE lightning quick, but I think they've started to slow down - that doesn't mean they are slow, but I don't think people are gonna be offers the same day anymore.
Liverpool seem to be quick (I got an offer for history from them in 3 working days, and I know a couple of other people who got law offers after 2 days.)
Lougborough are also pretty quick, friend got an offer for computer science in 4 days.