Granted we don't have the same issues in Ireland that we did with the french summers (as in, no air conditioning, which meant no oven usage from May to August) - but we do change food in the "summer".
I think I've mentioned the Cork Food Market before, but we stopped in a grabbed some nice antipasto stuff. Cheese (of course), crusty bread, olives, stuffed grape leaves, artichoke hearts, sun-dried tomatoes (in the olive oil), a little cold bean salad thingy, and sliced meats.
Jamie was particularly proud of his sliced meat selection - a nice sampler of 5 cold meats (3-4 thin slices each) for about 2 euros (don't convert to dollars, it's still bad).