Take Junction 8/9 indicated Maidenhead/Henley.
Leave the M4 at Junction 8/9, and take the A308 to Maidenhead where you will approach a roundabout.
Take first left on A308 bypass to next roundabout, going under railway bridge.
Pass Railway station, through traffic lights and continue on A308 to next roundabout.
Take second exit on A308, Marlow Road.
Be aware of speed cameras (30 mph limit).
After cameras you will pass an Esso garage on right hand side.
Continue to next lights, turning right into The Switchback (South).
A short way along this road, you will see a car garage (Exlers) on the left, and turn immediately
right into the office complex. (The Switchback)
Unit 4 can be found in the top left hand corner.