Now hidden in a small wood,but in 1940,during the Battle of Britain,this was expected to be the Front Line.About 1/2 mile to the east was RAF Fairlop,now dismantled. see http://en.wikipedia.org/wiki/RAF_Fairlop see http://www.wartimememories.co.uk/airfields/fairlop.html see http://en.wikipedia.org/wiki/Outer_London_Defence_Ring see http://en.wikipedia.org/wiki/British_hardened_field_defences_of_World_War_II