Im just warning you that there was a recall recently on some vectras due to a fault in the hand break. You bring your car to the garage and they replace it for free.
My dad did this but its still faulty. He parked outside my house when collecting my sister and put the hand break on. (there is a very very gentle slope. The car took off and landed in a garden at the bottom of our estate and it was extremely lucky that the children playing outside were not killed. So if you have one alway park in gear and dont trust the hand break