Suggestions on what to do in London, with adult niece, before/after theatre?

[Jupiterdawn]

Hello, I'm taking my niece to the Criterion as part of her Christmas present, on 2nd December (we're seeing a play she wants to see). She comes in to Liverpool St so I'm looking for ideas on what to do before and after the play.....christmas shopping/cocktails/food etc close to the theatre (or reasonable cab journey). Any ideas gratefully received. TIA

forgot- we're thinking food and christmas cocktails

stick by the theatre. Jermyn Street and Fortnums are fantastic for really special Christmas stuff and are steeped in London history - the cheese shop has the same counter as it had when Beau Brummell bought his cheese there etc. A wander down Burlington arcade opposite Fortnums is also an absolute delight even if you're not going to buy anything. There's a new cocktail bar open in the back of the Royal Academy at the back of Burlington Arcade which looks lovely. Brasserie Zedel right by the theatre has a very impressive room. If you want a slightly more unusual menu, I really like Nopi just up the road. I think there's also a Le Labo store very near there in Soho? NB - none of these are budget options but they are all unique and non chain and very London!

thanks so much TranmereRover, they all sound incredible!