I have an N reg 306 D Turbo which is supposed to have an alarm fitted, I know it has an immobiliser because it has the keypad which I have to type my code in before setting off. However the hand book describes the locking operations with a key which has two buttons on. My key only has one button. When I press the button it locks the doors but the indicators don't flash so I don't think it is arming it. Do you think maybe I have a replacement key rather than the original? And if so any ideas on how to set the alarm when locking up? Cheers Alex