Silverfish - Lepisma saccharina 1
Silverfish - Lepisma saccharina. It took me a while, but eventually I found out there is only one UK species of these fascinating creatures. Such a relief to discover that you don't have to disect the things to get a good i.d. - flea Beetles are probably jealous! Indoors, Winchester, Hampshire, UK. 30th March 2012. Scale in mm.
UK species list of Bristletails and Silverfish available here: Natural History Museum Checklist. Perhaps I'll put something similar on Wikipedia one day...
Family - Lepismatidae. Order - Zygentoma or Thysanura. Both are used at the moment.
OS Grid Ref: SU4627. Map location approximate.