As a longstanding customer of Yauatcha and Hakkansan, I've finally found a new favourite.
The staff are very helpful and prepared my assembled party a customised variation of the tasting menu to suit tastes. Admittedly, the decour is better at Hakkasan.
Prices aren't cheap (feast at £150/head plus wine/service) but worth every penny.
I wouldn't recommend this joint for pre/post theatre - it's enough of an event itself.