Ryde
in the county of Isle of Wight
Notting Hill
in the county of Greater London
Ripon
a Historic City in the county of North Yorkshire
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in the county of Monmouthshire1 picture
in the county of Cheshire2 pictures
in the county of Isle of Man1 picture
in the county of Midlothian1 picture
in the county of Greater London1 picture
in the county of Herefordshire1 picture
in the county of West Yorkshire1 picture (1 comment)
in the county of Gloucestershire1 picture
in the county of Northumberland1 picture (1 comment)
in the county of Tyne & Wear1 picture
in the county of Berkshire4 pictures (1 comment)
in the town of Donnington, in the county of Berkshire1 picture
in the town of Laxey, in the county of Isle of Man1 picture (1 comment)
in the town of Ludlow, in the county of Shropshire2 pictures
in the town of Chepstow, in the county of Monmouthshire1 picture (3 comments)
All over Britain on Ordnance Survey maps there are heights and contours shown. All over Britain there are Ordnance Survey bench marks etched onto substantial buildings from which the height of the bench can be assertained, not to mention all the triangulation pillars with their heights recorded. All these heights all over Britain are based on the Ordnance Survey Datum level based on the mean sea level at Newlyn. There is a fundamental bench mark sealed in the end of the harbour pier.
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