Should I consider a gap year?

Applied to Cambridge, Imperial, Bath, QMUL and City London with AAA*A in Maths, CS, Physics and FM. I also got an A in EPQ with a 4.8 TMUA.

I got rejected from bath and cambridge, and got offers from QMUL and City. My question is that in the (likely) event I get rejected from Imperial, should I take a gap year over going to QMUL?