As if there wasn't enough to worry about in the world of food already, with supermarkets filling our heads with the need for special offer junk, sugar in absolutely everything and multi-national companies tampering with whatever takes their fancy, GMO OMG has planted the seed of nightmare killer corn and chemically engineered soya. I thought I was doing my bit by being a vegetarian, growing my own fruit and veg and forcing it on my kids instead of feeding them McDonalds, but "no!", the scientists have been at my seeds. When I first got my allotment there was an enormous parsnip growing happily there that went to seed and I was warned against collecting the seed because my parsnips "wouldn't come true". I nodded wisely, thinking "poppycock" in my head and collected the seed anyway. But what was in this whole "not coming true" business? Should I be scared of my hundreds of seeds that I got for free? Basically a F1 hybrid seed invol...