cazap
This is the best I can do for Mount Street, a couple of photos of the old Mill and Millpond that were in the Mount pleasant (Mount St) area. Also a couple of photos of the park that was put in place of the millpond known locally as Spion Cop park.
As I said before these photos are on the site somewhere as I'm sure thats where a couple of these photos come from.
As for St Paul's Square, I'm afraid I can't help at all with that, as I only have modern photos that can be picked up anywhere.