happymummyofone I have gone up thread to try to find the context for your quote of £175.00 per week on food.
We are two adults and two teenagers. I spend about £180-£200 pw at the supermarket - admittedly mostly Waitrose. We do not have expensive cuts and I cook a lot from scratch. It also includes things like toiletries, cleaning stuff and some pet food (Waitrose has it on offer regularly and I tend to stock up).
We eat well, there are lots of things like Penguins, cashew nuts, cake for the DC, wine and beers for the adults.
In perspective though, I am genuinely quite frugal and will buy a chicken rather than a double rib of beef (mostly) because I do try not to be "silly".
In context though that is a tiny percentage of our income and if I had to, there is plenty of slack to be cut - and if I had to (and didn't work and had time to shop around - go the Aldi, etc, which would take a disproportionate amount of my time at present), I'm sure the figure could easily be halved.
Ultimately though, in this house two adults go to work and work jolly hard so at present we don't need to make any cuts and actually contribute hugely to others. We try to spend our money wisely and I don't see why those to whom we make huge contributions shouldn't also spend theirs wisely.
We don't go to the pub, we don't smoke, we don't have Sky, we don't spend silly money on mobiles. I really don't see why we should contribute towards the unnecessary spending of others. However, I am very happy to contribute to those who are disabled, who are widowed, who care for disabled children and those who need rather than want help.