So this afternoon I had a nice visit from the environmental health chap.
He was polite and pleasant and quickly acknowledged I knew way more about Cockerel and noise than he did, he said my efforts were beyond reasonable. He did acknowledge I'd probably see him again due to the nature of the neighbour but that's fine, he thought my chooks were very smart, we'll cared for and NOT in a position to cause a nuisance, so long as they are shut in at night...
So that's only a problem if I ever need a night away... But as he pointed out it has to be a persistent continuous nuisance to be served an abatement order so if I'm away by the time they come to visit I'll be back in routine so no action can be taken...
I like the man from the council :-D