Yes that does seem a lot. I spend £between 70-80 per week for a family of four in Aldi. When I swapped to Sainsbury's over lockdown, it was £110-20 a week (I've always said, Aldi is about £30 per week cheaper!).
I don't buy expensive joints of meat. If you make a bolognaise, buy a big 1kg punnet of 5% fat beef mince, but cut it in half and only use half of it in your pasta sauce. Make up the sauce with tinned toms and other veg. You don't need loads of meat in it, just enough to give it flavour.
It's cheaper to buy a large whole chicken and make it stretch two meals, than other chicken joints. On the second day, use the scraps in a stew or soup (or even a curry if you have enough).
I don't use any stir in sauces. All sauces can be made with tinned tomatoes, garlic and herbs (oregano or mixed italian herbs, or smoked paprika and cumin for chilli), or milk flour and cheese for a creamy one.
If you slow cook a big gammon joint, you can save the juices and use it to make lovely sauces and soups. You don't need as many gammon pieces in your dish either to give it great flavour.
I make an 8 egg omelete with a tin of chickpeas or butterbeans whisked in. Can also add spinach, mushroom, etc. It has a thicker consistency, but my kids don't notice the difference and it gives them more veg.
You don't need loads of topping on a jacket potato - even a bit of bolognaise gives enough sauce, with veg on the side. Do a jack night and you could even do tuna mayonaise or cheese on top.
Big bags of frozen veg like green beans and sweetcorn cost less than fresh.
I don't buy any unhealthy sugary treats - they are unnecessary and often expensive.
Hope some of that helps.