I must confess that for the most part this won't be too difficult for me. I always shop and cater for England, stick useable leftovers in the freezer, forget half the things I have lurking at the back of the cupboard or the bottom of the freezer, and drag another 20 carry bags home each week. 
I am running out of cupboard space, feeling a little guilty about waste (especially of fresh fruit and veg) and more than a little guilty about the money I spend on having stuff tons of storecupboard stuff I never get round to using.
I'm not insisting I/you buy nothing at all - just that I am going to try to plan menus for the next two weeks or so based around as many ingredients as possible that I know I already have.
Who's in?
Tonight I am going to make Martha Stewart's Farmhouse chowder here.
I have all of the ingredients except the swede so I will put some diced potato in instead. I do have the turnips though. I will also add a bit of leftover celery, and will chop and fry up the two rashers of streaky bacon I have in the fridge, and add that. I might top it with some small squares of ready made puff pastry I've had knocking around in the back of the freezer forever, so it's more of an unreconstructed chicken pie.