This issue also includes other items of local (underground) interest: a report on the underground WW2 Field Hospital in Erith, and an article on Chiselhurst Caves in WW1.
check out sub-brit at http://www.subbrit.org.uk/
ps - Nick Catford is amazingly busy. I have just come back from a holiday in the Scottish borders. Looking for info on the (defunct) Rothbury Railway Station, I find the main source on the net is written by Nick. (thanks!)