Probably £70? Don't eat that much meat and, as other posters have said, I'm never convinced that in the UK organic meat is farmer so differently from grass-fed, a known British farm etc.
At the moment I feel I spend a lot more than I 'need' to buying British food, eg apples, pears, lettuce, earlier in the summer peas, now overcooked strawberries and sometimes these things would actually taste better from another country.
OP, how much do you spend on non-organic shopping? You must buy some stuff that isn't, I imagine, eg cleaning products, various cupboard items (crackers, crisps, baking powder etc), alcohol (some self-labelled organic wine available, sure, but the overlapping set of organic wine and good wine seems small). I spend a lot more on non-organic food than organic food.
What I can't FULLY understand is how I now spend about £250 a week on food (for four people, plus one more in our 'bubble' but that's only a couple of times a week). Probably £40 of that is alcohol, and £20 stuff that is obviously treats/ unnecessary (fancy nuts, magnum lollies). But the rest seems to be stuff that we actually eat... I know I could spend much less, but I don't know how to organise it to do so...