Maybe if it had soil in it they would use it? Mine have the whole garden to play in but always end up at the side under the hedge in a dirt hole they dug. I don't re-fill them so its been getting deeper and deeper. It's almost too deep for them now lol. I'm expecting to have a missing chicken...
Hi fellow Brit, sending from Leeds.
Your coop is really nice. I especially like your tire idea. I never thought of that but will do the same for my chickens - I bet they will love it.