Milestone in Front of the Wheal Martyn China Clay Museum (Museum Not Included) is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 8 November 1999. Milestone. 1 related planning application.

Milestone in Front of the Wheal Martyn China Clay Museum (Museum Not Included)

WRENN ID
under-chamber-merlin
Grade
II
Local Planning Authority
Cornwall
Constituency
St Austell and Newquay MP: Noah Law (Lab)
Country
England
Date first listed
8 November 1999
Type
Milestone
Address
Milestone in Front of the Wheal Martyn China Clay Museum (Museum Not Included), Treverbyn, PL26 8XG
OS grid reference
SX 005 553
Coordinates
50.36449, -4.80542
Source
Historic England listing

Also on this page: sale history · EPC · related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

This milestone, dating from the early 19th century, is located in front of the Wheal Martyn China Clay Museum. It is a triangular-shaped granite monolith that is painted and features two inscribed faces. The left side has the inscription "B over 9," while the right side displays "St A over 2." The milestone also includes an Ordnance Survey bench mark.

Local climate

Milestone in Front of the Wheal Martyn China Clay Museum (Museum Not Included) receives an average of 960 mm of rain a year. This makes it wetter than 74% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 86% of listed buildings.

It experiences an average of 10 freeze-thaw cycles a year, fewer than 91% of listed buildings. Of these, 4 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 3 transactions since 1998
  • Related listed building consents — 1 application
  • 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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