What are you already eating and bored of / what are your requirements?
Here's a £50 for one week of dinners which are usually just reheated for lunch the next day, or put into a wrap with salad bits.
Day1 dinner - chick pea curry & rice.
Day2 mash leftover chickpeas into falafels with some flour if necessary, have with couscous & salad
Day3 500g mince chilli con carne padded out with various types of beans - in jacket potato (just use a big potatoe dont buy actual jacket potato
Day4 lunch: chilli con carne in wraps. Dinner: ratatouille with rice
Day5 big pack of chicken thighs (with bones) w/ potato wedges and veggies. Roast the chicken in the oven and use it for wedges too (just chopped potatoes with skin on, oil and salt). Keep some chicken aside. Boil the bones, using scraping from the tin to make it extra chickeny
Day 6 - leftover chicken prized from bones - use for Thai green curry w/ broccoli and green beans
Day 6 (alternate) wagamama style noodle soup from dried noodles and stock - add a poached egg, broccoli, Chinese chilli oil, cabbage and spring onions to it
Day 7 - pizza base from scratch, tomato paste and any leftovers from the rest of the week! If no leftovers, I'll use tinned tuna
Shopping list: (I'm never sure how much people eat). I'm assuming you have other basics like spices!
Meat: pack of chicken thighs, minced beef
Dry: rice, noodles, couscous, tinned chick peas, tinned various beans, flour, tinned tomatoes, passata paste, eggs, jalapeños, wraps
Heavy vegetables: one bag red onions, a garlic, one bag mixed potatoes:
Vegetables: broccoli, red cabbage, green beans, carrots
Salad veg (this are where it can get fairly expensive but I get these at least:) lettuce not from a bag, cherry tomatoes, cucumber