London Christmas lunch recommendations?

[NumberOneBestseller]

Hello everyone, we’re a v small charity (5 people) looking for a Christmas lunch venue. It can’t be a pub.
We’re London based and I wondered if anyone could recommend somewhere that does a nice Christmas lunch that isn’t too expensive? TIA

What counts as not too expensive and which part of London?

Casa do Frango or The Table Cafe at Bankside

Thanks @Fivemoreminutes1, The Table Cafe looks good.

@unfortunateevents Preferably less than £25 per head