Am I right in guessing that you have a neighbor or neighbors who keep chickens without shelter and that you want to report them for cruelty and force them to provide shelter for their birds?
We do have individuals in the U.S. in diverse climates who keep birds outside without shelter, letting them roost in trees overnight. Most of them tend to be in the warmer, more southern areas, though. Some of them are members of BYC, but not many.
I had to look up the Pennine Range to find out more about your climate. Wikipedia says that the climate "...is generally temperate like that of the rest of England, but the hills have more precipitation, stronger winds and colder weather than the surrounding areas." It does tend to depend which side of the Pennines in terms of precipitation, since there is a rain shadow on the eastern side. However, it was clear that winters are harsher there, and it provided the following average temperatures over a 30 year span:
There are two aspects, both the weather and the exposure to predators. I don't know what your local RSPCA would consider about it, but most folks here would think it was poor judgement, and poor care of the chickens. I am not sure that a scatter of opinions from a social network of chicken lovers will move your local authorities, but... good luck!
Welcome to Back Yard Chickens, in case you are sticking around.