... and handbrake should be a 5 minute adjustment surely ?

no, unfortunately it isn´t...
There simply is no chance of the cable-operated "mini-brakepads"-handbrake to hold the car other than in complete standstill.
With my Roadster 3.7 you
really have to check that the handbrake has been fully & properly loosened before taking off - the torque simply doesn´t mind it being applied in any considerable way

Up to now i didn´t find a proper way to make it work as intended (
did they intend it to work (properly) ?)