New Grounds Harlington
The car park for New Grounds, Harlington, is off Sundon Road, immediately to the south of the crossroads in the centre of the village (opposite the Carpenter's Arms pub). Please drive as far through the car park as possible and park at the New Grounds end (not tarmacked).
The satellite view shows shows the playing field (in yellow box) and where to park (red box).
Postcode LU5 6LS will get you close by SatNav.