Somewhere to eat near Cambridge Theatre in London, please?

[Ceolas]

I'm taking my 2 daughters to see Matilda the Musical next week. None of us have been to London before! Can anyone recommend some place good and not too pricey to eat before the show, please?

We're going in a couple of weeks. I decided to play it safe and have booked Brown's. The internet suggests it isn't too far a walk. If you google restaurants near Matilda trip advisor brings up suggestions but seeing as my daughter is a fusspot I decided a chain restaurant would be better.