Geograph - photograph every grid square

Coal Tax Posts were markers defining the area within which the Corporation of London could charge duty on coal entering the area. This area had been expanded in 1851 but then reduced in 1861 to coincide with the Metropolitan Police District of the day, the limits of which were between about 20 km and 30km from Charing Cross. It is from this latter time that most of the existing posts date. See Link for further background, with much more comprehensive information at Martin Nail's excellent site, Link. This includes a full list of extant posts, at Link.