Pic not yet available so I'd better explain - in case folk think I'm prone to tell porkies!
A neighbour up the road breeds bird of prey - for falconers etc and I believe takes in injured raptors. He avoids publicity. A few years ago and shortly after returning from down-under, we were delighted for several weeks to hear a Koockaburra calling and were told that he had one or more on his premises.
Four days ago an allotment neighbour and I heard a Kook very nearby yet seemingly c.300m from the bird breeder's dwelling.
Yesterday SWMBO and a different allotment neighbour saw a Kook flitting from tree to tree and calling. We assume it has escaped from down the road. The neighbour took a pic.
PS: About 10 years ago SWMBO and I were on safari with others down-under and sitting round the campfire eating what we had just cooked. We noticed a Kook perched on a nearby post. Suddenly it swooped and flew off with a sausage from my neighbour's plate........