No longer a tree, but 'tis all the same to a Woodpecker.
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Great Spotted Woodpeckers are known to use telegraph poles (causing so much damage in some localities that model Black Woodpeckers have been used to try to deter them - leading to some 'sightings' of Black Woodpecker eg in Cumbria last year!). I am not aware of Green Woodpeckers using telegraph poles, though presumably its possible.
Lat/Lng: 50.93921, -0.40736
OS grid ref: TQ119167