Wheels off ground = No hand brake

[the evil twin]

AHHHH. So it's the tailshaft that is locked / braked and not the wheels and it's the tailshaft being held stationary that holds the wheels stationary UNTIL they are lifted off the ground, so the hand brake doesn't act on the wheels at all, just the tailshaft.

Thanks ET, I owe you another beer. Awesome I've learnt something.

Nailed it dude ^^^^ ... (in fairness others said similar but I'll still take the Beer)