I probably spent no more than £15 a week on food, and then say another £20 for anything else. Of course, it'd vary a lot depending on what people were up to and the level of whiskey in my bottles, but I think I didn't spend more than £30 a week for any prolonged period.
Maybe with a proper kitchen this year, I might be spending more. But then, with houses you don't need to go out as much, because bringing the party here is cheaper... if messier.