This has now moved from outside orange gate and it is now at Kings Meadow/green car park.  Follow the AA road signs to the pick up/drop off point.  Once at Kings Meadow you should follow the signs to the boats and get the free shuttle boat service to the site. 

Orange Gate

There will be no public first entry at orange gate and so you must first be wristbanded at another gate before you will be allowed entry at orange gate.