Have to order yourself on the app and pay online, wasn't sure how to use my voucher we had so just left it, as a vegetarian celiac the pizza is amazing though the only vegetarian gluten free starter or side was corn on the cob, not exactly what I'd expect to eat while being out. So i ended up getting a side for my partner as it was a better deal to get pizza side and drink. Even though he has ALOT of options at the buffet. Felt it was a bit cheeky asking for a tip online when the staff have really no interaction with you bar showing you to a table.