I'm entertaining the idea of being in London for the weekend of May 24 - 27. However, I'm researching hotels in the Mayfair/Knightsbridge area right now and none come up as under 900+ GBP per night for 3 - 4 people. I've tried other weekends like May 10 - 12 and the same hotels could be had for ~500 GBP per night. Would anyone be able to shed some light on this?

-mattking2000