Well as it's been a month since I last posted a question..... I've just received my onion sets for autumn planting (if it ever stops raining). I've got Shakespeare, Radar and Snowball (which I'm sure I didn't order but that's another story). As I go through them all to chuck out the mouldy ones (just what you want), some are at least twice big as others. Should I expect the larger ones to produce larger onions? Many thanks for the responses.