Hi Bob
Dragged out another map - not the latest, but fairly modern, Nicholson. For one thing, there were loads of tiny streets in the space you mention, which have disappeared.
For another problem, I had another look today and there are bits of streets on different levels because of the building of the railway, and the station. Of course there are tunnels underneath the station too.
We do know from the Wood's map that Water Street is the other side of Collier Lane from Cecil Street. It joins at right angles. I think it iss maybe where if you come out of the long stay car park, there is the remains of a lane formed of sets that hits Collier Lane almost opposite the doors of the hotel garage, just out of site on my photo of Collier Lane above.
On my more modern map, South John Street is between Crown Street and Water Street, as opposed to John Street near Caldewgate.
Having a think!
Emms