More nice bussy stuff..
The photos might be from 1949, although by the look of the restricted wartime blinds on the RTs on the 38, they might also be from 1948.
The 137 shown at Sloane Square lost it's allocation of STLs (see here) in January 1950.
From the comments on that page:
"What would be awesome is if someone finds the same vantage points, and take photos today and put them side by side." - what a great idea... ;-)
"When we launch The Retroscope around July, it will be possible to stand at the same vantage points and, using a smartphone, see these pictures hovering over the scene as it is now, in Augmented Reality". Wow!