London Coal Duty Marker on District Boundary at Tl 2570 0240 is a Grade II listed building in the Welwyn Hatfield local planning authority area, England. First listed on 30 April 1986. Marker.
London Coal Duty Marker on District Boundary at Tl 2570 0240
- WRENN ID
- ruined-gallery-sage
- Grade
- II
- Local Planning Authority
- Welwyn Hatfield
- Constituency
- Welwyn Hatfield MP: Andrew Lewin (Lab)
- Country
- England
- Date first listed
- 30 April 1986
- Type
- Marker
- Address
- London Coal Duty Marker on District Boundary at Tl 2570 0240, Heath Road, North Mymms
- OS grid reference
- TL 257 023
- Coordinates
- 51.70625, -0.1822
- Source
- Historic England listing
Description
The London Coal Duty Marker, located on the district boundary at Little Heath, was erected in 1861 and is a Grade II listed structure. It was cast by Henry Grissell at the Regents Canal Ironworks and marks the extent of coal duty, which extends 20 miles from the General Post Office. The marker is a cast iron square pier that stands one and a half metres high and is painted white. It features chamfered corners and a pyramid-shaped top. The City of London crest is displayed on the necking, and the front face bears the inscription "24 Vict".
Local climate
London Coal Duty Marker on District Boundary at Tl 2570 0240 sits in one of the driest parts of the UK, with an average of 700 mm of rain a year. This makes it drier than 91% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 90% of listed buildings.
It experiences an average of 33 freeze-thaw cycles a year, fewer than 54% of listed buildings. Of these, 15 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
More on this building
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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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