There's four of us, including a teenager. We spend probably about £200-£250 a month total. We do a LARGE shop about every 3 weeks or so at Sainsburys, with little top-ups of milk and bread and fresh veg about 2-3 times a week. We also do a shop at Lidl about every 4-5 weeks, where I stock up on juice, tinned stuff, rice & pasta, frozen pizza and treats like ice lollies and chocolates.