Spag bol and chicken thighs both go down well in this house, don't cost a lot to make, and freeze really well. Plus using up leftovers is always good too.
So, if you bought one pack of mince, a 6/8 pack of chicken thighs, two tins of tomatoes, two tins of beans, a bag of pasta and a pack of carrots, a pack of potatoes, one cucumber, two big cheap frozen pizzas, and some frozen sweetcorn you could have:
Pasta bolonaise for 2 meals (add carrots to the bolognaise, plus any onion or garlic or stock cubes etc which you have at home: freeze half the bolognaise and have on different days)
Roast chicken with potatoes and carrots for one meal
Chunky chicken soup made with chicken, pots, carrots, sweetcorn. (you don't need much chicken for this - just use the extra one from the day before plus any leftovers - add gravy or stock cube or herbs or anything like that which you have in already)
Jacket potato with beans served with carrots and sweetcorn
Pizza with cucumber and carrot sticks
That gives you 12 meals total including the ones which you from whats in for about £15....