It would be worth investing in a slow cooker as they're really useful, and mean you can put something on in the morning and it's ready when you get home at night.
Many have a 'stay warm' option which keeps the food warm until everyone's eaten (if you need to have staggered mealtimes).
They're not expensive; the smaller ones range from £10 upwards and this one is the same size as mine and will easily feed 10+ ppl if filled to near the top.
It's £19.99 from Argos and would easily be big enough to feed 7 www.argos.co.uk/product/6992679
It would save money in the long term as you'd be using less electricity, and less pots and pans would mean less washing up, etc, too.
They're not just for stews and casseroles; you can also make things like meatloaf, curry, lasagne, porridge, pot roasts, honey mustard chicken thighs,etc, pulled pork/beef,etc, soups and even puddings.
Wrt, sticking to a budget, I find meal planning and making a shopping list (& sticking to it) are the best things to do.
I find pasta, sauces, tinned beans, tomatoes, etc, are often cheaper in the 'world food' aisles than elsewhere in the shop.
Eg, in Morrison's 4 × tins of 400g kidney beans for £1 in world food aisle, but 60p each in tinned veg aisle.
I try to combine/reuse ingredients so that I can use leftovers in the next meal, etc, so for roast chicken the carcass and scraps would be used the next day to make chicken soup/stew. Eg, pack of 3 courgettes: 2 used for courgetti in one meal and then 1 grated along with onion and potatoes to make vegetable rosti/fritters for another day (cheap, tasty and filling... even my veggie hating dd loves these).
I tend to use whatever veg needs using up (including broccoli and cauliflower stalks), as well as a few potatoes.
Bulking mince dishes out with red lentils, which you can hardly taste keeps coats down, so 500g pack of minced beef with 200g red lentils, etc, would be easily enough to feed 7 if made into a chilli con carne or Bolognese sauce or cottage pie , etc.
Also adding grated or finely diced veg to such dishes keeps costs down whilst bulking the meal out so it feeds more ppl.
Also swapping minced beef to minced pork or turkey, which is cheaper, often works well and doesn't change much in the way of taste. Even using 50/50 would help.
Try buying cheaper brands for a week or 2 to see if you prefer them/can get used to them as that'll save money long term. My dd was convinced she only liked Heinz ketchup, so to test her I bought Morrison's own brand and poured it into the empty Heinz bottle and she never even noticed! But when I later offered her the bit left in the Morrison's bottle, it 'tasted horrid!' Funny how she'd had no complaints when it was in the branded bottle, lol. She now has Morrison's ketchup!
Aldi's cleaning products are just as good as the brands, so I'd recommend them.