DH and I usually spend about £200-250 a month, not including going out to eat, which we usually only do once, or at most twice, a month (unless there is a special occasion). I cook every night, and we don't buy ready meals. Sometimes I get into a "recipe" kick where I like to pick out different recipes from my collection of cookbooks, and that can add to the bill. With a little one on the way in September, those days are numbered anyway.
I usually shop at Sainsburys or the local greengrocers or fishmongers, but I do like certain things from M&S and Waitrose and try to limit myself to those things when I go there, like M&S desserts (I love their custard!) and Waitrose's meat. It's too expensive to do my everyday shopping there. We also get an organic box of veg delivered every week, so most of our veg (except a couple of "extras") is taken care of that way. DH has been making his own sandwiches to take to work, which cuts out the extra daily expense of him having to buy something on the way to work and cuts down on waste here at home since it's not just up to me to eat a loaf of bread in a few days. I've never liked shopping every other day, so I usually try to go with my MIL every other week or so to do a big shop where I stock up on dried goods and stuff I can freeze and just supplement in between with the local shops. Since we like to buy free range, we just choose to eat meat less during the week and save that way as well. There are plenty of great veggie meals out there.