With only one opening, that you'd have to stoop to get through, and no ventilation, I think it would be hard to clean out if housing mucky animals like ducks or chickens. And HOT when the sun's out. That's what confuses me.
It's on a Welsh hillside so I'd say the occasional gust of wind is feasible!
Maybe I should just figure out what it CAN be used for and go from there!