Crikey. Those buses. What year was that?
The photo is squashed, so they look particularly weird, but they are normal single-decker buses from the 1970s. The 12A route was withdrawn in 1990. McDonalds probably opened in the early 1980s, so I’m pretty sure this is a photo from the 1980s - probably around the middle but it would be hard to be certain - unless you knew when McDonalds opened or Plug and Socket closed.
There is still a Sainsbury’s floor mosaic by the front door.