BEST MOTORCYCLING SOCKS EVER?

This is a photo of my grandfather and grandmother on my grandfather’s BSA. I’m guessing the photo was taken during the 1920s/30s. I was hoping you could identify the model.

Mark Cain, Sheffield

That’s a BSA Sloper, probably 500cc from about 1929. These came out in 1928 and were a very successful model, taking over from the older flat-tank range. Cheers, Rick P