Androlis mites for chemical-free biological control of red mite.
This:
https://dragonfli.co.uk/products/androlis-chicken-mite-predators?_pos=1&_si...
If you're having trouble with red mites on your hens in the hot weather, this stuff is excellent. Only giving it away because the bottle is enough for 15 birds and I've only got 3 so I've had all I need.
Red mite control for poultry owners (Florence Park OX4)
This offer has been gifted to someone and is no longer available.