Around 90 pounds a week for 6 of us in term time and 7 in the holidays. ( 2 adult kids, 1 early teen, a ten year old and a 7 year old) It would be less if DH would eat what the rest of us do, but mostly he won't, so I have to buy ready meal curries, burgers, oven chips and the like for him. TBH, it costs as much to feed him as it does to feed all the rest of us put together.
That includes toiletries, cleaning stuff, drynites for 7 year old and the like and is for 3 meals a day for everyone except DH, who buys a sandwich or something at work.
I cook everything from scratch, bake all my own bread, cakes, biscuits etc., we don't really drink so no alcohol. I am veggie and the kids eat veggie quite a lot. Meat is spun out, a chicken will make 4 meals and soup, 1lb of mince will make 2 meals, a joint will make 4 or 5 meals plus soup if it has a bone. Other things are made meaty with a little bit of chorizo, pepperoni or bacon pieces. Fish is usually tinned or frozen. I also bulk cook dried beans and pulses and use them to make different meals. We eat beans of some sort at least 3 times a week most weeks.
At this time of year, my veg patch produces more than we can eat, so I freeze or preserve stuff for the winter. I pick wild fruit to make into jam/chutney/pie filling. I also never waste anything. This week I will make soup from the leaves and stalks of the broccoli and cauliflower, pea pods, turnip tops, carrot tops and leek tops left from the veggies. I use any milk or cream that doesn't get used and goes off (not very often) in baking, any left over bread gets turned into either breadcrumbs, croutons, teabread or whatever.
If I didn't have to buy stuff for DH, I could get the bill down to 60pounds or so, but what can I do? The list of things he won't eat is so long that no sane person would believe it. OP, I think that your husband is being very selfish, 20pounds is a lot of money for beer, especially if you are struggling to put food on the table. Could he not be persuaded to even cut that in half? You have to prioritise your spending and, to be honest, beer is not a priority, or it shouldn't be. But then, I can't say anything, really, because my DH will not be persuaded either to stop smoking or to eat what the rest of us do, because he doesn't do mince/chicken (except breast fillet in an extremely hot sauce)/eggs/beans (except baked ones in a tin)/pork except fillet/beef except fillet/vegetables/soup/pasta (except with Dress or LG tomato and chilli sauce and only certain shapes of pasta)/fish (except tuna in a sandwich)/ lamb/sausages/pies/ham/cold meat/hm jam, pickles etc......
Anyway, advice would be to meal plan tightly down to snacks and drinks, to maybe try another supermarket if you can to see if it is cheaper, to eat more veggie meals and to try to persuade your husband to downgrade the beer spend.