Indeed Robin. Occam's razor suggests that the simplest of explanations is the most likely. Given that Salford in the 1940s and 50s was a dark, dirty place (I was born there in the early 50s and remember "Hanky Park" well), seeing a girl on the streets would indicate lighter nights. Prostitutes would be seen at the docks, and some other places, in all seasons at all times of day and night.

Meself, please feel free to think what you will. I really am not arguing.

Here is an interesting analysis from an unusual source. It may take you to a subscribe page. If it does, Google Financial Times Dirty Old Yosn