Me and DH never buy anything 'out' now. We take cheddars, crisps, apples, cereal bars, and 'breakfast yogurt biscuits' when we go out for the day, (Or we know we won't be back til mid afternoon,) in case we get peckish. Used to have a lunchtime Maccies, or a Greggs, or a Burger King... But even they have all gone mad now with their prices.
Me and DH used to have (at Maccies,): small fries, mcflurry and cappuccino for me, and a medium extra value meal for him. Used to be £6.50 to £7.00 in total pre 2020, and now costs a £10-11. Sausage rolls and cakes from Greggs used to be 45p to 60p each, now cost about 85p to a pound. Also, as you say @WaltonOnNaze and many others have, the price of sandwiches has doubled.
Even meals in supermarket cafes that used to cost us £10-12 for the two, now cost more like £18-20. And don't even get me STARTED on Chinese takeaways. WAS £11 to £13 for me and DH pre 2020. Now around £26. Ludicrous. As I say, we never buy food 'out' any more. No Maccies, no Greggs, no shop-bought sandwiches, and no takeaways.
I know everything has gone up yada yada blah blah, but I don't believe it NEEDS to go as much. Nope, I really don't. Fucking DOUBLED in price most stuff has. In 2 to 2.5 years. SOME stuff has TRIPLED in price!