40th birthday - venues?

[Devonlover]

I'm planning my 40th birthday next Feb, and am looking for somewhere nice in Brighton to hold a lunch on a Saturday for around 25 people. It won't be too wild as I'll be 7 mths pregnant by then, but somewhere not too pricey, with good food, good atmosphere etc would be great. Either a nice pub or smartish restaurant, or maybe somewhere with a private room where we can tuck ourselves away. Any ideas much appreciated!
Thx!