Deep Bench Mark: Barbican A   

Ove Arup BH13 - below manhole cover [3GL]; DEEP BM BARBICAN SITE A LAUDERDALE TWR.

Location
Grid reference: TQ 3213 8180.
Landranger 176: West London, Rickmansworth & Staines.
Landranger 177: East London, Billericay & Gravesend.
Waypoint: DP0002.

Neighbouring Flush Brackets

S7174	Newgate Street, General Post Office 432.67m to the southwest.
S0541	St Paul's Cathedral 637.89m to the south.
S7175	Shoreditch, Town Hall 1.46km to the northeast.
S0834	Aldgate, St. Botolph's Church 1.58km to the east.
L4	London, Trinity Square 1.70km to the southeast.

The nearest fundamental bench mark is Croydon, 21.18km 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 Deep Bench Mark Ove Arup BH13 - below manhole cover.