Roughly what part of London do you live in, how far are you willing to travel and what mode (driving, public transport)?
You’ve got places like Brunel and Royal Holloway that are ‘London’ but on the outskirts, or you can look at places like Uni of Surrey, Uni of Hertfordshire etc which aren’t necessarily a million miles out of London, although could be a fair distance dependent on the answer to the above questions!