Put some bait out for him a couple of nights before you plan your ambush, they are creatures of habit. Buy a packet of liver (less than a £1) and leave it out in the same spot, it will always enjoy a free and easy meal, then on the third night all you need to do is sit tight and be patient and hope the stench of the liver is stronger than your scent (not being cheeky... you know what I mean).
Also apply for your FAC as if their are chickens about, this will not be a one off, foxes will move into an area that has a supply of juicy tender chickens.
Happy hunting and don't forget to pu