Milk to go in coffee at home.
Coffees out.
Anything hair / beauty related (get my OH to cut the ends occasionally).
Buying gifts for friends or extended family.
Low carb diet food - very effective, but unaffordable when pasta is £1 for a bag.
"Proper" meat - breaded fish and chicken are much cheaper, and you can just serve them with frozen chips and peas ad infinitum, without having to buy ingredients for sauces / other bits in a recipe.
The gym.
New clothes, stuff to decorate, stuff for the house, obviously.