McDonalds then or Pizza Hut .... depends on the age of the youngest member of the party. Cater for their taste and leave any grown-ups to marvel at your skill with children. Anyway few places other than those mentioned will be able to cater for nine at this time of year without a prior booking (well not if they are any good they wont) Pizza Hut looks a good bet to me. Should get away with £50 if you avoid the over priced bottled beers.