Now, according to Mr Titchmarsh in his book about growing your own veg, you should NEVER plant those sprouty spuds you get at the end of a scak of potatoes bought from the market...
Apparently, you should only ever plant seed potatoes bought from a garden centre or seed supplier as these are guaranteed to be disease free.
Well, after having just dug up about 8 kilos of spuds grown from sprouting supermarket potatoes, and only having lost few of them to slugs, worm of careless forking (that's FORKING, Clunk... not a euphemism or Two Ronnies style accent), I'm quite happy to tell Mr Titchmarsh where he can shove his seed potatoes.