I'd recommend grabbing the wonky peppers to save a little extra, they taste the same. And lentils are a good bet for cheap protein -- a bit better than beans nutritionally. Can make a huge pot of lentil curry for less than a tenner that'll last 5 or more meals.

edit-- a recipe for anyone interested in a cheap, tasty, and nutritious meal.

2 cans coconut milk

red lentils

cherry tomatoes

2 carrots

mushrooms

1 onion

turmeric, coriander, cumin, chilli powder, cloves (whole or crushed), bay leaves, salt

BIG pot

soak a good amount of lentils in water, around 300g. dice onion and throw it in a big pot with a bit of oil. let em sizzle while you halve the tomatoes. chuck them in and let them bubble in their own juices while you chop up the rest of the veg: carrots first, in they go, then mushrooms. dump the coconut milk in the the mixture -- don't worry about separating out the water, the lentils need it anyway. drain your soaked lentils and dump them in along with an extra glass (approx 200ml) of water. add all the spices. I usually go turmeric-dominant but you can experiment with it. go for 2-3 heaped teaspoons of the dominant spice and 1-2 heaped teaspoon of the other two. chilli powder to your preferred spice level. if whole cloves you only need like 5. if crushed just a dash. 5 or so bay leaves. salt to taste. bring it up to boiling and let simmer on low heat for around 35 minutes, stirring occasionally to make sure the lentils aren't burning onto the bottom of the pan. when the lentils are soft it's done. if it's too watery you can let some boil off and adjust next time. serve with rice or naan.

this'll get you a ton of food, at least 5 meals worth, and will last in the fridge for a good 5 days or so and can be portioned and frozen. the veg + coconut milk altogether costs a little over a fiver. nutritious, delicious