To :- Bruce Everis
I was employed at CAD Kineton, as it was then, and I found your references on another web site.
I have signed in to inform you that you should not believe everything you are told.
I left there in 1991 and during my time there I found no underground road or rail infrastructure in existance at that time or since.
Having said that I believe that there may have been some storage places dug into the side of the Edgehill escarpment during the war to create additional storage.
But as for underground storage, rail and road facilities, sorry they do not exist.
It does make a good story though.
If you would like further information please feel free to contact me at this address, firstname.lastname@example.org