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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.

A long distance path in southern England. It runs from Farnham to Dover, past Godalming, Guildford, Dorking, Merstham, Otford and Rochester, along the Surrey Hills Area of Outstanding Natural Beauty (AONB) and Kent Downs AONB. East of Boughton Lees, the path splits in two, the northern section running via Canterbury and the southern via Wye. The two sections of the path reunite at Dover. The northern route is 211 km long, and the southern route 201 km, the total length of the North Downs Way being 246 km.
The pathway is mixed in that it varies throughout its length from footpath status to bridleway, byway and road. Some 19% of the Way follows roads, though 75% of those are minor lanes. It is marked by an acorn. See TQ6561 : Crossover in Long Distance pathways.
See Link for more details and an interactive map of the trail.