Since we both retired we don't do a regular shop anymore, but as and when we need to, which isn't actually often.
DH has a walk every morning, so pops into the co-op to have a look at their yellow stickers, if there's anything 'wondrous' he picks it up and it's either dinner that evening, or put in the freezer.
Roughly twice a month we go to Aldi to stock up on essentials and visit Waitrose every three weeks or so, for delicious extras. We've got our Waitrose timing perfect now, and usually pick up lots of reduced sticker produce. Last night we had sea bass fillets, Jersey royal potatoes and tenderstem broccoli, all Waitrose, total cost, £3-59!
We go to Costco for cereals, fresh/frozen veg and meat for the freezer about once every six weeks.
We have a takeaway about every third week, and eat lunch out about three times a month, very rarely have evening meal out, as we like to get 'comfy' in the evenings!
We hardly drink alcohol at all, so very little spent there, but I have a weakness for Blue Mountain coffee, which is a tad expensive, so I limit myself to two cups a day, and drink herbal tea or water the rest of the time. I buy my coffee as beans and grind them just before using, beans are cheaper than ground, and stay much fresher much longer.
I think all in, our 'weekly' amount averages out at £75 - £100 for two of us, no pets, but we eat very, very well.