Well site has been trashed by who knows, hatch is not present and surface part of the air vent is no longer standing. I hope the pictures speak for the underground parts of the post as it has been heavily fire damaged and looks like it has been used as some sort of rubbish dump.
Subbrit page http://www.subbrit.org.uk/cgi-bin/webdata_roc.pl?fid=988112649&query=Post%2BName%3D%26OS%2BGridRef%3D%26County%3D%26Date%2Bopened%3D%26Date%2Bclosed%3D%26Location%3D%26Description%3D%26Surface%2BStructures%3D%26Date%2Bof%2Bvisit%3D%26Future%2Bactions%3D%26pagenum%3D1%26cgifunction%3DSearch&cgifunction=form
Subbrit page http://www.subbrit.org.uk/cgi-bin/webdata_roc.pl?fid=988112649&query=Post%2BName%3D%26OS%2BGridRef%3D%26County%3D%26Date%2Bopened%3D%26Date%2Bclosed%3D%26Location%3D%26Description%3D%26Surface%2BStructures%3D%26Date%2Bof%2Bvisit%3D%26Future%2Bactions%3D%26pagenum%3D1%26cgifunction%3DSearch&cgifunction=form