London Coal Duty Marker on District Boundary 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
- WRENN ID
- worn-tallow-evening
- Grade
- II
- Local Planning Authority
- Welwyn Hatfield
- Constituency
- Welwyn Hatfield MP: Andrew Lewin (Lab)
- Country
- England
- Date first listed
- 12 August 1985
- Type
- Marker
- Address
- London Coal Duty Marker on District Boundary, Warrengate Road, North Mymms
- OS grid reference
- TL 230 031
- Coordinates
- 51.71372, -0.2206
- Source
- Historic England listing
Description
The London Coal Duty Marker, located on the district boundary at Warrengate Road in Potters Bar, dates from 1861. It was cast by H. Grissell at the Regents Canal Ironworks. This marker is a cast iron square pier with chamfered corners and a pyramid top, which is painted white. It features the City of London crest on the necking and has the inscription '24 Vict' on the front face.
Local climate
London Coal Duty Marker on District Boundary 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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