Hi Folks, as promised here is the final version of the 1975 Cityscape, thanks to everyone who contributed. My knowledge of Gas St at that time is confined to The Factory NIghclub (near The Opposite Lock Club, a venue I didn't frequent) so I really can't hazard a guess where this shot was taken from, probably from the 15+ story of a tower block, not on Gas St, one suggestion was from Cumberland House on Granville St, but checking my aging copy (2013) of The Birmingham A-Z this seem unlikely.
Peg.