Where can I apply?

I did my UCAT and got 2420 B3. It was genuinely a shock since I was averaging 2700+ with B1/B2 so I don't know what happened - I am already considering a gap year because I want to remain in London but I don't know if there are any unis that will accept me in here. I was thinking of applying to King's Foundation Programme and just give a try in Queen Mary since my grades and personal statement seem promising - I might be wasting it but it's still worth a try. I just don't know where else to apply and any other advice would be appreciated