The reason for asking: I drink real cider and Wetherspoons fairly consistently sells it (most pubs don't), out of a bag-in-a-box in the fridge. But the majority of Spoons meals are now sold on a "meal+drink" basis. How you buy this with a real cider is something that perpetually perplexes their staff, and seems to vary from pub to pub.
There's two ways it could be set up, which are either "promotions" (if the two things appear anywhere on the same bill, they're automatically grouped) or "recipes" (choose one item from column A and one item from column B). I suspect the real ciders are simply left out of the right categories by whoever does the data maintenance, maybe because they change frequently.
Also you can't leave any comments/requests with your order, for instance asking for a Coke without a slice of lime.