I came across this larva by chance while looking for glowing adult glow worms (Lampyris noctiluca) at Aston Rowant National Nature Reserve, Oxfordshire in July a few years ago. The illumination is an ordinary torch. The aspect ratio has come out wrong -- it should be 4:3. Subsequent sequences show adult glow worms. For more info on glow worms, go to glowworms.org.uk