Deep Bench Mark: Shell   

Under manhole, 60' SW of SE angle of Shell Building [3GL].

Location
Grid reference: TQ 3095 8015.
Landranger 176: West London, Rickmansworth & Staines.
Landranger 177: East London, Billericay & Gravesend.
Waypoint: DP0001.

Neighbouring Flush Brackets

S1012	Tower Street 730.00m to the southeast.
S0972	New Scotland Yard 760.59m to the southwest.
FB	Big Ben 834.09m to the southwest.
S0971	Victoria Embankment 834.87m to the southwest.
G5139	Kennington, Police Station 865.85m to the south.

The nearest fundamental bench mark is Croydon, 19.58km to the south.

Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Croydon to Buntingford levelling line. The surveyor's description was Shell Deep BM - under manhole, 60' SW of SE angle of Shell Building.