I thought of a list that can make at least a weeks worth of dinner with leftovers for 1 person for £19.71 from Asda.
Fish and chips w mushy peas
X4 just essentials battered fish fillets £2.50
Asda classic malt Vinegar £0.35
1.5kg Asda straight cut chips £1.65
X2 tins of just essentials Mushy peas £0.70
Sausage and mash
8 Richmond pork sausages £1.75
2kg just essentials potatos £1.39
1kg Asda onions £0.99
Asda Gravy granules £1
Meatball pasta
500g Asda lean pork mince £2.59
X4 just essentials Tinned spaghetti loops £0.76
Just essentials Mixed herbs £0.48
1kg just essentials Mixed veg £0.99
Roll
X2 asda tinned sardines in sunflower oil £1
X6 just essentials whole meal bread rolls £0.49
250g just essentials mushrooms £0.75
Just essentials Lettuce £0.69
250g just essentials Cherry tomatos £0.69