London Coal Duty Marker on District Boundary 50 Metres West of Hatfield Road is a Grade II listed building in the Welwyn Hatfield local planning authority area, England. First listed on 12 August 1985. Marker.
London Coal Duty Marker on District Boundary 50 Metres West of Hatfield Road
- WRENN ID
- shadowed-pediment-vale
- Grade
- II
- Local Planning Authority
- Welwyn Hatfield
- Constituency
- Hertsmere MP: Sir Oliver Dowden (Con)
- Country
- England
- Date first listed
- 12 August 1985
- Type
- Marker
- OS grid reference
- TL 260 021
- Coordinates
- 51.70378, -0.17721
- Source
- Historic England listing
Description
The London Coal Duty Marker, located 50 metres west of Hatfield Road in Potters Bar, is a cast iron square pier that stands one and a half metres high. It was cast in 1861 by Henry Grissell at the Regents Canal Ironworks. The marker features chamfered corners and a pyramid top, and it is painted white. The necking of the pier displays the City of London crest, while the front face has the inscription '24 Vict'. This marker indicates the extent of coal duty, which extends 20 miles in circumference from the General Post Office.
Local climate
London Coal Duty Marker on District Boundary 50 Metres West of Hatfield Road 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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