£50 is a push - but I think it can be done without sacrificing decent healthy meals.
I have £60 a week for 6 of us (2 adults, 3 children, 1 weaned baby) and baby still in nappies.
I buy meat in bulk from the butchers for the mth (£40 out of one weeks £60). The buther usually goves me areebie as well so thats another meal.
I go to the market for fruit and veg and barter. Everything else is from Aldi/ Lidl. Every fortnight I spend about a fiver on fish from the fishmonger and that makes 2 meals. I use ecoballs to wash with mainly so very rarely use any powder.....I have a huge box that was 7.99 from aldi that has lasted me for as long as I can remember.
I only buy 1 box of cereal a week for the kids and the rest of the time they have porridge. I have one multi purpoise cleaing product and make the rest myself.
I dont buy juice,kichen roll, biscuits, cakes, quiches, ready made pizza, sauces, etc
I cook at least 2 non meat/ fish dishes a week and use lots of lentils, beans, chick peas etc.
in fact if i tried to do it on oven chips and turkey twizzlers it would cost a good deal more