Cooking on a budget

I'm on a grocery challenge the next two weeks which is terrifying me. We're off on holiday in a few weeks time and I need to have a bit of a use up from the freezer and cupboard, but also need desperately to cut down on the food bills !

I know that food costs have gone up massively in the last few years but our food bills are now HUGE. I also know that feeding two small boys costs an arm and a leg if I want them to eat lots of fresh stuff but surely £450 a month for 4 of us is too much ?!

I've been through the freezer and cupboards and am planning as we speak. My challenge ? Not to spend more than £50 on food per week for the next 2 weeks - eeeek !