£70-£80 a week inc delivery from Asda plus the odd extra loaf and milk from the local shop if we run out. That's for 2 adults, 2 kids (6+8) and a cat.
I rarely eat out if I'm away from home at lunch time, I'll take sandwiches. I figure that I've paid once to fill the cupboards at home, I'm not paying again to buy more stuff when I'm out.