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OSBM Bolt: Brockley 
OSBM Bolt on wall, S side of road, 1' SW from SW angle of road junction.
Location
Grid reference: ST 4725 6678.
Landranger 171: Cardiff & Newport, Pontypool.
Landranger 172: Bristol & Bath, Thornbury & Chew Magna.
Landranger 182: Weston-super-Mare, Bridgwater & Wells.
Structure: Roadside wall.
Waypoint: OS0426.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Flax Bourton,
6.40km to the northeast.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the North Petherton to Flax Bourton levelling line. The surveyor's description was OSBM Bolt on wall, S side of road, 1' SW from SW angle of road junction.
Location
Grid reference: ST 4725 6678.
Landranger 171: Cardiff & Newport, Pontypool.
Landranger 172: Bristol & Bath, Thornbury & Chew Magna.
Landranger 182: Weston-super-Mare, Bridgwater & Wells.
Structure: Roadside wall.
Waypoint: OS0426.
Neighbouring Flush Brackets
| G2263 | West Town 1.56km to the northeast. |
| G2261 | Cleeve 1.57km to the southwest. |
| 387 | Chelvey 1.84km to the northwest. |
| 388 | Nailsea Railway Station 2.50km to the north. |
| 386 | Kenn Moor Gate 2.61km to the west. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the North Petherton to Flax Bourton levelling line. The surveyor's description was OSBM Bolt on wall, S side of road, 1' SW from SW angle of road junction.
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