Thank you and LOL.....they're not in trees! I was walking on a cobbled road through some very old mills and saw these down in a working yard and i asked someone if i could takes a few shots. the corrugated roof was part of 4 work sheds.
The small area is known as 'Jumble Hole, very close to Hebden Bridge in West Yorkshire...There are a number of waterfalls tumbling down the very steel valley where some are impossible to get to. This on was ok but still awkward!