In message , Robin Mayes
writes
I am guessing that a direct subterranean passage from the west
end of St Pauls platforms

Would probably lead you into some very intresting places, but then we'd have
to kill you.

It would be under the Old Bailey, or were you thinking "telephone
exchanges" ? St Pauls station used to be called "Post Office" after the
building demolished after the war (it was bombed several times) behind
where BT Centre now is.
--
Roland Perry