My hens live in a coop inside a large run in the garden which has plenty of space for them to run around, flap and scratch etc. but I've recently been toying with the idea of letting them out of the run to have run of the garden. My only worry is they may escape. My garden is secure and has 6' fences all around, are they likely to reach the fences if I clip their wings? I live in Norfolk, UK and don't appear to have many predators that would get into our garden, maybe foxes however, I haven't ever seen any in our neighbourhood (and I'm out at literally all hours). Having said this, there are a lot of domestic cats around are these likely to harm my hens?