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Cut Mark: Twyford Bridge, School 
Old B.M. on S.E. corner of school, S.W. from Twyford Bridge [2GL] - estimated location (close to FB 2812).
Location
Grid reference: SK 6978 7497.
Landranger 120: Mansfield & Worksop, Sherwood Forest.
Structure: School.
Waypoint: BM2630.
Neighbouring Bench Marks
The nearest fundamental bench mark is Navenby,
35.48km to the southeast.
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 74.8830 feet [22.8243 metres] above mean sea level (Newlyn datum). It was included as a side level on the Hibaldstow to Matlock levelling line. The surveyor's description was Old B.M. on S.E. corner of school, S.W. from Twyford Bridge.
Location
Grid reference: SK 6978 7497.
Landranger 120: Mansfield & Worksop, Sherwood Forest.
Structure: School.
Waypoint: BM2630.
Neighbouring Bench Marks
| BM | Retford, Moorgate 6.78km to the north. |
Second Geodetic Levelling, England & Wales (1912-21)
This bench mark was used during the Second geodetic levelling, England & Wales, and was levelled with a height of 74.8830 feet [22.8243 metres] above mean sea level (Newlyn datum). It was included as a side level on the Hibaldstow to Matlock levelling line. The surveyor's description was Old B.M. on S.E. corner of school, S.W. from Twyford Bridge.
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