Cherlyn, first thing I thought of when I saw you were in England was WEASAL too!! I think it
could possibly be a moggie ( that's on of these:
guys!), but really not as likely. Fox will usually carry a kill off into cover to eat it away from the coop and eat most of it too not just the head.
Could you do us a HUGE favor and edit the thread title to say something like, "Unknown predator in ENGLAND, BRITAIN, That bigish island across the ATLANTIC you Yanks!!! OK, just kidding there, mostly.
Every time someone claims it was a raccoon,
I wanted to reach through my monitor
... and no, no slapping, but at least a gentle SHAKE!
OK, I feel better now!
Rant is over!
(no, I'm from the US, just got to work with lots of everyone over the years,
)
I hope the camera shows you what it is, and before the critter gets any more too, but weasels can get into very small holes/cracks etc, so good luck!