From the M25 anti-clockwise: leave the motorway at junction 20 and head towards Watford on the A41. Go straight across the Hunton Bridge roundabout onto the A411, Hempstead Rd.
At the first set of traffic lights turn right into Langley Way, prompted by the sign "West Herts Hockey Club".
At the roundabout by the Essex Arms public house go straight over and to the bottom of the hill.
At the T-junction turn right into the playing fields area, you will see the astro lights in front to the left. Park sensibly by the pitch.
From the M25 clockwise: leave the motorway at junction 19 and at the roundabout take the 3rd exit onto the A411 Hempstead Rd. Follow directions as above.