Tonight, on the way back from the pub, I found a sick barn owl.
It was sick enough that it let me take a phone photo from close range, but had enough life that at attempt at capture with the hands failed (just flew 5 yards along the road).
There is a Barn Owl Centre a couple of miles from home (in Quedgeley), but phones are 9 am to 9 pm, and email is phone us for the address. Given the weather forecast, I don't suppose it will survive for a morning contact.
Update:
I went back on Saturday morning ("Tonight" having been Thursday evening), and there was no sign of it ever having been there. Maybe it had been temporarily stunned by a car windscreen.
Interestingly, it was only 200 yards along the road from where I'd found a red-legged partridge asleep in the middle of the road one evening a couple of years previously. That didn't wake up until I picked it up, prior to putting it in the adjacent field