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I've been making lunches in a similar way. pre-cooked beluga lentils and freekeh mixed, then chopped cherry tomatos and salad onions with diced cucumber and peppers dressed with olive oil and a bit of red wine vinegar, roasted brocolli and courgette, sliced cooked chicken. A lot of it is pre-cooked (I do the broccoli and courgette) so it's not as cheap as it could be - looking at an Ocado order it's £20 for 6 meals, but I feel good after, eat less in the evening and I have one less decision to make in the day. I'm planning to switch in some smoked tofu and the like to make it vegan.
Make salad, two days worth in one go:
Tin of butter beans
Tin of sweetcorn
Cherry tomatoes
Cucumber
Mushrooms
Spring onion
Cheese
Nuts
Seeds
Dressing
Low cost, healthy, with practice it can be made drunk or hungover in <10 mins.