I think everybody is meeting at 13.30 in the atrium bit, just near where it branches off to the family room/changing room. There's an ice rink in the atrium at the moment but I think there should be plenty of space still.
If I remember right, there's an eating bit where it's open seating with several little food places round the outside, that might be a good option so there's something for everybody and no need to book.
ETA - The Balcony is where I meant - https://uk.westfield.com/london/find/search/dining?category=2035
If I remember right, there's an eating bit where it's open seating with several little food places round the outside, that might be a good option so there's something for everybody and no need to book.
ETA - The Balcony is where I meant - https://uk.westfield.com/london/find/search/dining?category=2035