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This bench mark was established in 1858 during the First primary levelling, England & Wales, and was levelled with a height of 344.5180 feet [105.0091 metres] above mean sea level (Liverpool datum). It was included on the Llandysilio to Stafford levelling line. The surveyor's description was No. 98. Bolt in North-west angle of Gnosall Church ; 2.69 ft. above surface (p588).