Good stuff!
My suggestion, if it's difficult to fit in at the end of this year (what with all the office parties etc. etc.) would be maybe early Jan, assuming you're not all off racing in South Africa, wintering in Mustique etc. etc.
If the venue gets tight for 30+ people, I have a couple of other ideas for venues, albeit 'in my neck of the woods' (i.e. Cotswolds).
Alternative would be a Sunday lunch type affair.
James