This reference is believed to be for the following:
CAMPBELL, JOHN GREENBANK
Rank: Second Lieutenant
Date of Death: 08/05/1918
Regiment/Service: Yorkshire Regiment 2nd Bn.
Panel 52 to 54 and 162A.
TYNE COT MEMORIAL
Son of Thomas and Agnes Campbell, of Town Head, Austwick, Lancaster.
Source: Commonwealth War Graves Commission.