You would face prosecution for keeping birds in the small confined conditions ST keeps her birds if she was in the UK.
A quarter acre of grassy backyard would constitute "small confined conditions" in the UK? How odd.
You forgot to mention the rabitt hutches you keep them in
The only time any of our chickens were in a rabbit hutch was when we first brought the red hens home. They needed to be treated for lice and worms, and were on antibiotics for a month. Those 5 were in very sad shape when we got them. Once they were healthy again, they went into the yard with the other hens. Now they are only locked in the coop when it's -25C or colder - then we close the door and turn on a heat lamp.