For my Wife, myself and out 2 month old I think it'd average to about £80-90 for the weekly shop and then maybe £10-30 more depending on what happens in the week, that does include stuff like nappies, formula, cleaning products though.
We make our own lunches for work but i sometimes use the works canteen or if i'm out and about in the works van will stop at a cafe or get a meal deal but that's probably only once every couple of weeks.
Then it depends if we get a takeaway (maybe every 2 weeks) and if we stop and have coffee or a lunch when we're out and about on the weekend.
We do eat a lot of fresh fish which seems to cost quite a lot as my wife is a pescaterian so by default i pretty much am too and when i do occasionally have meat i tend to buy nice stuff.