Welcome to planDisney, Araminta. It can be trickier to secure dining reservations for larger Guest parties, but anything is possible - this is the magic of Walt Disney World after all!
As you have a larger party, you may find it easier to speak with one of the
Disney Experts to help make dining reservations. They can advise on the best way to ensure all your party can enjoy dining adventures at Walt Disney World. Larger parties are accommodated well in restaurants such as
Boma - Flavors of Africa where we recently enjoyed breakfast seated next to a large family (incidentally from the U.K. too). Along with all the usual breakfast buffet options, there were additional dishes with unique flavors that helped make it a memorable morning. I suggest booking as soon as you can if you have a particular dining experience you wish to secure.
In my experience, booking through the My Disney Experience App works better for smaller parties. So my suggestion here would be to split your group in two and select dining bookings at as close intervals as possible. When checking in for your table, speak with a Cast Member to request tables together, and I know they will work hard to accommodate your party's needs when possible.
Another recommendation you might find handy is
Mobile Food & Beverage Ordering, providing access to all the fantastic Quick Service dining options at Walt Disney World on the day. Casey's Corner, for example, is sure to have something to suit everyone. Need even more flexibility? The delectable takeaway dining options around the World Showcase in EPCOT are always a winner.
I hope this information helps, Araminta. Best wishes to every Guest in your party for a magical time at Walt Disney World, Louise.