I am visiting London on regular base since 1992, 4 to 6 times a year.
Since 1994 I am minimum once a year visiting the restaurant with private and business guests. I have ever been very comfortable with the service and especially with the food which has an extra-ordinary quality. I compare it with continental-standards (i.e. Italy, France, Swiss, German or Austrian quality)in the higher-class restaurants.
Especially if you like to have a lot of different kind of food (here it will be served on small dishes)
The service is doing a very good job - any time I tried (nearly every time I have been there) I recommended the restaurant to a lot of foreign friends which all very happy about this "insider-information". But, and this is a positiv "but", you should drink traditional tea or non-alcoholic drinks otherwise you have to spent a fortune for the top Red Wines from Lebanon !