If the facility is being used regularly, practically nothing. Plus, being able to do these kinds of things is a great boost for morale for people who like what they're doing.

Well the consumable confectionery items cost about £1.15

https://www.tesco.com/groceries/en-GB/products/254923832

Except, no, there are eight teacakes, so they must have bought at least two packets.

Wonder who ate the other four?