Leave the M25 at Junction 11 and take the A320 towards Woking. After about five miles you will reach a large roundabout. Take the third exit (towards central Woking). At the next roundabout take the first exit in to the centre of town. Take the third exit at the mini-roundabout. Finally turn into Christchurch Way, second on the right. St. Andrews House is 50 metres on your left.