Going to London for a day in the holidays - I used to do this about once every half term, but it's just too expensive on the train now, even to do free activities.
Actually getting the train anywhere.
Cutting down on treats etc from supermarkets, and on coffee/cakes etc when I go out - I used to go for a long walk a couple of times a week, and end up in another village and visit a cafe, but it's too expensive now (and sadly my motivation for exercising is lower as a result!).
Hair cuts less often. No blow dries.
No newspapers now to sit in a cafe with. Partly because of not going to cafes much anymore, but also the price of the paper so I can't even replicate it by sitting outside with my own coffee.
Trying to walk to save bus fare during the daytime.
More frozen veg instead of fresh, and things like frozen onions and garlic and herbs and so on - might seem more expensive initially but for one person, it actually saves them from going off when I don't use enough otherwise.