oh well then go north on the m25 take junction 28 (brentwood)go past the Post house Hotel follow rd through the town turn left at the mini roundabout (by a furniture store on the right) stay on the rd you are now on only one fork to worry about and that is after the robinhood/little john pub keep right follow rd for what seems forever and you will see a sign that says Nuclear bunker ahead thats what you are looking for ...be careful as the turnoff is sorta on a bend (left hand turn) once off the rd and on the tarmaced rd follow it through the field you will see the cars parked up, how you see this in time to work out the route