A map from the <a href="https://en.wikipedia.org/wiki/Ordnance_Survey" class="extiw" title="w:Ordnance Survey">Ordnance Survey</a> of <a href="https://en.wikipedia.org/wiki/British_national_grid_reference_system" class="extiw" title="w:British national grid reference system">grid reference</a> HW at a scale of 1:250.000.
Ordnance Survey
OS OpenData
<a rel="nofollow" class="external text" href="https://www.ordnancesurvey.co.uk/opendatadownload/products.html">Ordnance Survey OpenData</a> 1:250 000 Scale Colour Raster. Converted from <a href="//commons.wikimedia.org/wiki/File:Ordnance_Survey_1-250000_-_HW.tif" title="File:Ordnance Survey 1-250000 - HW.tif">File:Ordnance Survey 1-250000 - HW.tif</a> to jpg