The position of the icon shown above was derived from coordinates provided by Streetmap when the portal's location was originally plotted on the 1:25000/1:50000 Ordnance Survey maps hosted on that site. A link to that map is provided on the left. It is however clear that while the arrow appears to point to the portal, the actual coordinates are inaccurate by widely varying amounts. We will correct this over time but if you find an icon that is considerably displaced from the relevant portal, please Contact us via the link in the sidebar and we will correct it as a priority.