Leave M25 at Junction 25, and head northbound (Cheshunt/Hertford) on the A10. At first roundabout take 3rd exit. At next roundabout turn left and just after the railway bridge turn left. Ground is approximately 400 yards on the right. You cannot turn right into Theobalds Lane from the A10.
400 yards from Theobalds Grove (BR) station. Turn left out of station and first left into Theobalds Lane. Ground is on the right hand side.