Cut Mark: Simpson, Church   

Old B.M. on buttress, S.W. angle St. Thomas's Church, Simpson [2GL] - approximate location only.

Location
Grid reference: SP 8832 3619.
Landranger 152: Northampton & Milton Keynes, Buckingham & Daventry.
Structure: Church.
Waypoint: BM2560.

Neighbouring Bench Marks

BM	Simpson, Canal Bridge 286.36m to the northwest.
BM	Bletchley, #176 Western Road 2.36km to the southwest.
BM	Bletchley, Milton Keynes Register Office 2.40km to the south.
BM	Bletchley, #14 Cambridge Street 2.51km to the south.
BM	Bletchley, The Bletchley Arms 2.52km to the south.

The nearest fundamental bench mark is Great Linford, 6.98km to the northwest.

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 212.0140 feet [64.6219 metres] above mean sea level (Newlyn datum). It was included as a side level on the Great Linford to Hemel Hempstead levelling line. The surveyor's description was Old B.M. on buttress, S.W. angle St. Thomas's Church, Simpson.