Does anyone have any comment on Claridges?
I have booked the Dorchester for my trip in March but I wouldn't mind trying Claridges for the one after.

I can only mainly comment on food advantages at some of the hotels, but here it goes:

The Dorchester - Alain Ducasse offers an excellent value meal (same for lunch and dinner, I think) at £125 pp for the tasting menu. It is much better priced than their Paris restaurant, and the food is really great (in my opinion, well-deserving their 2nd Michelin star). Service was pretty top notch too.

Mandarin Oriental - Foliage may be a little adventurous for some people with a very traditional taste, but everything works very well. It's also very, very reasonably priced for what it is. Service is pretty good too.

Claridges - Gordon Ramsay wasn't anywhere near as good as Alain Ducasse. There were some dishes that did not really impress me. Service was pretty good though, so no real complaint, although they could do much better in terms of the food.