I can see the point that people are making about the budgets not being in most people's reach but the concepts of menu planning and using up left overs have sadly been forgotten by many people today.
I have found since I started menu planning and doing weekly shopping at Lidl, supplemented by fortnightly shopping at Sainsbury's, that my grocery bill has dropped by about a third.
For a family of three, we now eat well on £70/week (altohugh ds has school lunches 4 days a week over and above that) - and that still includes our freshly squeezed orange juice every day and a weekly bottle of Cava and the odd case of beer (other wine is supplied by dh "bought" from his wine business).
Yestrday's was the first episode I watched and I liked the idea of the salmon - but can see that you might want to freeze some fo the dishes to have in different weeks, just for variety. But it is a TV programme that they are making - and the principle still holds of getting suffieinct for a week from one major purchase.
I do often buy a leg of lamb and make that last all week: first night roast lamb with roast or new potatoes, 2nd night cold roast lamb with chips, 3rd night "suleman's pilaf" (fried onions, garlic, diced tomatoes, raisins and pine nuts, diced lamb, fried together and then mixed with plenty of rice), 4th night, shepherds pie with hidden veg (base made with minced lamb, onions, canned tomatoes, carrots/celery/leeks/anything else in the fridge/frozen chopped spinach, mash made with potatoes and/or parsnips and/or carrots and/or swede). 5th night, a spag bol made from spare shepherds pie base. As we don't eat meat every night, a couple of other nights would be, say, herb risotto or a frittata.
And there is usually still some Suleman's Pilaf and shepherd's pie base to go in the freezer for another week.
There is enough variety there that it doesn't feel like we are eating monotonous lamb every night All that from an £8.76 frozen leg of lamb from Lidl