During the winter months, I frequently walked Sweepy in the dark, often being out to near midnight. We'd walk through Margam Park and in the Forestry Commission land around Mynydd Margam, and it was fantastic, especially when there was snow on the ground.
If there was ever a low cloud base, the light pollution from the steel works at Port Talbot would reflect back down and form a uniform pale orange glow that was often so bright we'd cast shadows. If it was clear, we would be able to see the lights on the north Devon coast, and the ships in the Bristol Channel.
Once during a walk in the woods, we were stopped by a security patrol and warned of the presence of a large cat, after some workmen had found a large pawprint in some mud near the park. Apparently a plaster-cast of the print confirmed it was a large cat, though the guard wasn't sure what type. With a million billion deer in the area I am certain an escaped panther size cat could easily have existed there. I did however doubt that there was a risk of me or Sweepy being attacked by it as the guard implied.
The joys of dog ownership eh ?
Best night nav I've done to date though is this one though..... very atmospheric it was.
http://www.walkingforum.co.uk/index.php?topic=22088.0