two trigs together

[bones1]

i have visited greenham common and near the old control tower are two trigs,one standing and one lying on its side ,does anybody know its identification. jeff=bones1

[ted]

i have visited greenham common and near the old control tower are two trigs,one standing and one lying on its side ,does anybody know its identification.

The standing one is S6936 http://trigpointing.uk/trig/3492
and its predecessor was S5544: http://trigpointing.uk/trig/7431
which the OS record as levelled on 01/09/1950 and destroyed 11/53

There are other instances where a trig was replaced but the old pillar not removed.
For example, on Kinder Scout in Derbyshire, there is http://trigpointing.uk/trig/6378


Regards
Ted