Bejaysus, now you've piqued me into investigating this lass-lasses lassie-lassies business. After half an hour of strenuous googling and looking at all manner of dictionaries, and even the Robbie Burns website, I've come to the crystal-clear conclusion that it's a complete minefield. If you want to talk about more than one "bonny wee lassie" then you're justified in spelling the plural "lassies" without risk of being accused of talking about handsome small collies. But if you want to talk about more than the one lad rolling his lass in the new-mown hay then I reckon it should be "lads and lasses." Dammit. I hope Nigel isn't reading this bloody thread...