I'll bet you never thought you would see this headline in this thread!
Old Army Loos Halt The New Forth Crossing (from Sunday Herald)
The "s-shaped" air raid shelter sounds like a seagull trench to me.

__________________
Regards,

Gordon
History Vault Bookshop
FortressScotland-http://s2.photobucket.com/albums/y20/Historian/