Raffles, as at last year the booking period for RHR had gone up to 2 months although it is possible that it has been reduced back to one in the meantime.

Claridges at lunchtime is a real bargain but I have to agree that it is not as good as RHR. I suggest that you look at London Eating for reviews.

The Petrus was, in my opinion, better than RHR so I would expect Marcus Wareing at The Berkeley to be very good.