Topic's been split folks,
Have a look at this map below. I have located all the toilets that are underground around Glasgow.
There is also an underground toilet just outside the Govan Underground. If anyone else has locations of long lost Toilets located underground add it to the map and name the location.
Fieldon St Location A [Forge steelworks etc]
London Road Location B
Brigdeton Cross Location C
Morrison St Location D
Sauchiehall St Location E
Buccanan St Location F
Wilson St Location G
and at the bottom of jamaica St