Pic shows:- aerial view of Hoo Napoleonic fort, Medway, Kent. 1870s gun fort, later used as an observation post in WW2.

Pic shows:- aerial view of Hoo Napoleonic fort, Medway, Kent. 1870s gun fort, later used as an observation post in WW2.

Pic shows:- aerial view of Hoo Napoleonic fort, Medway, Kent. 1870s gun fort, later used as an observation post in WW2.

Pic shows:- aerial view of Hoo Napoleonic fort, Medway, Kent. 1870s gun fort, later used as an observation post in WW2.