Hi all I'm just looking in my catalogues and Internet and have come across a seed tattie called Orla. Anyone had this before, how have you found it. Also I'm finding conflicting sites, some selling by no of tubers 20 for 4.99 plus 5 postage. Another selling 2.5kg for about 5pounda if I recall. Am I better buying by number or weight, I have no idea how many seed potatos are approximately in a 2.5kg. Any clues???