Over the past decade there has been an explosion in `Snowdrop Mania" - galanthophiles, or snowdrop fans, desperate to get their hands on the newest species of snowdrops, paying hundreds, or even upwards of a £1000 at auction for a single bulb. Open Country meets Alan Street, who works for a family-owned nursery, where new varieties of snowdrop seed themselves around a little woodland - thanks in part to the huge number of species they already grow, working in collaboration with the family's bees