I just spotted these at Sainsbury's; does anyone know anything about them?
I can't remember where I read it but Purple M I believe are from American I think Colorado. They produce a solid purple coloured tuber, I liked the ones I've tried. I've saved a few tubers and set them to chit, hopefully they will do OK and I'll be extra happy it they produce some apples for seed next year. Here's a link to a recent thread http://www.allotments4all.co.uk/smf/index.php/topic,63462.0.html