Can anyone remind me of the phone number to book meals - I can't believe how close I am and I've not booked anything yet

DH likes to wait and see but I like to have something booked - especially for Walts and Inventions (as we're going to be there late July and over a weekend). I plan to phone Monday am before I leave for work, and at the moment I'm thinking:
Saturday 28/7 Steakhouse (because DH loves it and I thought it might be quieter?)
Sunday - brunch and Inventions (will 12.00 be OK?)
Monday:Walts for dinner (what is best time?)
I'm not booking anything for Tuesday as we might do the coach trip of Paris - is it OK to leave booking that til we get there?
TIA!!