Is it love for Jeremy the lefty snail?

Jeremy is a rare garden snail with an anticlockwise 'lefty' shell. Sadly for Jeremy he can only mate with a snail like him. After a plea to the public for help a lefty love match was found.

So how is it going? Is love in the air for Jeremy and his mates? Dr Angus Davison, reader in evolutionary genetics at the University of Nottingham, and Glyn Davies, executive director of Conservation WWF explain to the Today programme why some species find it so difficult to reproduce.