Last year a single snowdrop bulb was auctioned for more than £150. But even that figure is a small price to pay for the growing band of snowdrop collectors who are caught up in the contemporary equivalent of 17th-century Holland's tulip mania. Kerry ten Kate looks into the passions, the jealousies and the murky underworld of snowdrop mania with the enthusiasts who have a big obsession with a small plant. Producer: Gwenan Pennant Jones.