well I suppose my first suggestion if money is tight is to replace some meat and fish with lentils and pulses etc. they will fill you up but cost a lot less. rice is very expensive at the moment but pasta is cheap so pasta bakes just using tins of chopped tomatoes, some cheese on top etc, tin of tuna in it is a quick and easy one that won't be expensive, can do in bulk and then hubby can take some to work to reheat.
soups and stews I find are also good economically. frozen veg are just as healthy as fresh but easier to just use the amount you need.
things we do that everyone can have - jacket potatoes with ham/cheese/onion/beans and so on, spagetti bolognaise, chilli con carne, chicken pieces baked in the oven in chopped tomatoes with potatoes and cheese, stew, pasta bakes, veggie bakes, lasagne, veggie or meat.
own brand stuff, depends what it is. we buy value tissues and kitchen roll, sponges etc but I personally would prefer not to buy their meat because I am doubtful about it. buy own brand biscuits and crisps - they do seem to save.