Coming from Milton Keynes or the Buckingham direction, you would take the A422 or A421 to Buckingham, go round the ring road and after lots of dizzy roundabouts, take the A421 to Finmere (west). At Finmere take the A4421 south (that's to your left) to Bicester. This brings you to a big roundabout, having just passed the edge of the airfield and the old entrance on your left. At this roundabout, take the road to the left, Skimmindish Lane, ignoring any other signs pointing in a different direction. The airfield entrance is on your left about 150 yards along this road.