DIRECTIONS - 7 minutes from M25, Jct 20.

By car:
Exit the M25 at Junction 20.
Follow the A41, signposted Aylesbury, Hemel Hempstead (a very fast dual-carriageway through the countryside) for approximately 5 miles.
Take the exit signposted Bourne End Mills Industrial Estate Services (not the Bourne End exit).
After 50 metres turn left into Upper Bourne End Lane (this is a dead-end road leading to Runway Farm, up on the old WWII USAF bomber base).
After 900 metres pass straight ahead, through a set of iron gates, and onto a concrete hard standing.
Turn right through a set of blue gates onto a very wide concrete road.
Continue on this road for 300 metres, and then turn right onto the main runway.
Please park in the designated spaces.

By train:
Mainline British Rail. London Euston to Hemel Hempstead.
Take an inexpensive taxi (2 miles).