ITS EVEN ON NEW VEHS MY BROTHER BOUGHT A FOCUS ST PERFORMANCE BLUE WENT TO WORK PARKED IN THE CAR PARK WICH WAS ON A HILL. HOURS LATER HE HEARD LOADS OF CARS BIBING THERE HORNS OUT SIDE WENT OUTSIDE TO FIND HIS BRAN NEW ST IN THE MIDDLE OF THE ROAD LUKERLY NO DAMAGE AT ALL TO THE VEH DID NOT HIT ANYTHING JUST ROLLED REALLY SLOW.SO EVEN WITH NEW CARS LEAVE IT IN GEAR...............

Yep can agree with staying in gear on a hill. The pub i was staying in last week i put the handbrake on and the car was still moving. Was about a 45 degree slope.