Also how are the last family of 4 spending £664 a month on groceries, are they having steak & lobster and Bollinger for breakfast every day or something?
Due to multiple allergies in our house we never get it under £100 whilst still being healthy and buying enough to not need "top up" shops in the week, and we cook from scratch, analyse each recipt to see what we can cut back on for next time etc.
I've been on threads with people who say a family of 4 should spend no more than £70/week on groceries, which I understand isn't an option for some, but when you ask how on those threads, they mean £70 for FOOD ALONE! our £100 /week grocery shop included toiletries, whatever household bits we need like batteries, gifts, greeting cards. Its all in!
Some people who say they do a month on £300 aren't counting toiletries and their top-ups and other bits n pieces that all add up!