Thanks for the pics, derekdwc. I've now found the pic. I was looking for. It's from the 1947 Outline Plan by Reilly & Aslan.If you compare it with your pics, you can recognise the modern building. It's hard to read the Timothy Whites & Taylors, but it's next to Benefit, which was a shoe shop. On your black & white pic, you can see a sign sticking out of the building which says "CHEMIST"
BTW, Reilly & Aslan titled this pic. "irregular recent development". It clearly dates from the early 1930's & is classic art deco.
The pic. of Bon Marché is the old Robb's building.