I think it depends on what type of food you expect to purchase. DH and I spend about £400/month on groceries (including cleaning products, toiletries, etc). Sometimes more a month. However, we eat a lot of fresh meat and vegetables. We don't eat rice, pasta, potatoes, or bread. I'm a beef eater and he's a chicken eater so steak, nice beef roasts, extra lean mince and boneless chicken breast is what we usually purchase.