I found this Glow-worm on my evening walk to St Aldhelms. I wasn't sure of what it was & a quick look on the internet suggested it might have been an Oil Beetle larva. A photo put on twitter quickly showed the power of twitter with Jez & Sean confirming the correct identification. This is a larva of a Glow-worm Beetle & it takes three years before it reaches the adult stage when it glows to attract a mate.