Julian Cope presents Head Heritage

Years ago at work I was told of an incident where the Ordnance Survey using aerial photography picked up an apparent boundary feature running diagonally across a garden, which they showed on their updated version of the large scale map.

This sparked consternation from the landowner and when it was investigated by a surveyor on the ground, it turned out that the "boundary" was actually a washing line hung with sheets on the day the plane flew over.