Marker

z
52.658386°
W000.670956°

There is pill box near here. See https://www.geograph.org.uk/photo/6071297 , http://www.users.globalnet.co.uk/~rwbarnes/defence/stnmore.htm , https://becausetheyrethere.wordpress.com/2011/03/24/bleath-gill-whatever-happened-to-the-heroes/ .

Survey required.