
The showground postcode covers a large area, and may take you to the industrial estate along the road :-)
If you use the airport postcode your satnav will take you down the road after the showground (if travelling from the west), it doesn't really matter you can just go left at the roundabout in front of the airport to get back :-)
Just to clarify, because I wouldn't want you to end up having to pay £1 to get out of the airport follow your satnav until you come to a roundabout just before the airport with 2 large metal horse head sculptures on it - go left here. Then to the end of the road and turn right for the car park.