Jon N (UK) found a skatebike like I have never seen. No idea why it has a brake as unicycles are fixed pedal to wheel. There is no coasting. Unicycles never have a brake (except in unusual situations).
We call this a uniskate for lack of a better term. It is unlike anything we’ve ever seen. Unlike the LeRun skate bikes that have the skateboard truck in the front and are chain driven, this vehicle has the skateboard truck in the back and the drive is direct like a unicycle. The uniskate has a 20″ wheel and brakes and overall is decent shape. It is a real attention getter at club meetings and parades and is quite popular with children.