Hi, down here is Somerset we have a really bad problem with foxes for the last 18 months, my o/h shTjeot 4 in our garden last year, but we have had to keep all the chickens behind flexinet and electric fencing on the outside. Prior to this we had not lost a chicken in 8 years, they had full run of the garden and paddock. Once the fox knows their there, he will come and come again especially with the cold weather. We have a trap as well, always catch a fox on other people's land not our own!! The flexi net and electric fencing seems to work, and we can move it around for fresh ground, we do meat chickens twice a year and touch wood the fox has not had them with the same sort of fencing around them. Good luck.