Get a bread maker. I've saved loads by making bread for sandwiches, dough for rolls, garlic baguettes, pizza bases etc.
Aldi do a 1.5kg bag of strong bread flour for about 80p I think, for that you can make a couple of loaves, a couple of baguettes, 12 rolls, and approx 4 pizza bases for the freezer. 8 sachets of dried yeast is also about 80p. Use up leftover bread to make croutons, and then freeze.
I've stopped buying bread, pizzas, garlic bread, cakes etc, have saved a fortune.
Another top tip I got from here was to never throw any food away, so even a spoonful of peas will go in the freezer to be used in stews etc. Serve big meals in serving dishes, so people serve themselves, that way the leftovers can be re-used. In the freezer I have the odd portion of shepherds pie, macaroni cheese, stock from stews, leftover roast potatoes.
I always make a yummy vegetable soup with Sunday roast leftovers, which is my lunch all week.
Bulk out meals with lentils, pearl barley, or Yorkshire puddings.
Shop around, sometimes Iceland have better bargains than Aldi.