Tried out Adrian Harris' camera trap over the past two evenings near a badger set. First night (Saturday) was wet and the camera set too high - the result was two pictures of grey squirrels investigating the badger sets.
Grey Squirrel - well, a bit of one
Following a repositioning of the trap - lower and pointing down an animal track - bingo! A nice badger trying to show us his best side.
The system needs a little further refinement, but I think there's a start of something interesting.