1GL Bolt: Ashby-de-la-Zouch, St. Helen's Church   

Bolt in South-west abutment of Ashby-de-la-Zouch Church tower ; 1.62 ft. above surface [1GL, Leicester to Burton-upon-Trent, Mark No. 38]; BOLT ST HELENS CH PORCH SW FACE S ANG (131.9997m ODN, 0.5m AGL).

Location
Grid reference: SK 3606 1675.
Landranger 128: Derby & Burton upon Trent.
Structure: Church.
Waypoint: BT0744.

Neighbouring Bench Marks

BOLT	Ashby-de-la-Zouch, Holy Trinity Church 589.41m to the west.
BOLT	Ravenstone, Church 5.01km to the southeast.
BM	Broadstone 7.25km to the north.
BM	Ibstock, Ravenstone Road 7.32km to the southeast.
BM	Damson Cottage 7.35km to the north.

The nearest fundamental bench mark is Melbourne, 7.45km to the north.

First Primary Levelling, England & Wales (1840-60)
This bench mark was used during the First primary levelling, England & Wales, and was levelled with a height of 433.6280 feet [132.1698 metres] above mean sea level (Liverpool datum). It was included on the Leicester to Burton-upon-Trent levelling line. The surveyor's description was Bolt in South-west abutment of Ashby-de-la-Zouch Church tower ; 1.62 ft. above surface.