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Oh yes, we've many greengrocers, plus the usual M&S and Tesco, etc. I've so recently discovered I like the seeds in the yogurt (by 'The Collective Dairy', apparently in West London, and no, I'm not a shareholder!) that I wondered whether I could buy packs of them, as you can, say, pumpkin seeds.
Then I'd be able to scatter them through all kinds of foods and give the Other Half another opportunity to say I was trying to poison him. He thinks I try to do that, incidentally, if any vegetable matter appears on his plate!