When you get to the car park, drive to zone D and head to the far end of terminal forecourt to the valet parking drop-off point. A driver will come out to meet you, complete a form with you and park your car in one of Valet's secured car parks. All you need to do then is walk the 1-minute journey to the terminal.
When you've picked up your luggage, walk the short 5-minute journey to the Meet and Greet car park and go over to the reception office next to the coach station. The staff there will give you back your keys and direct you to your car.