No idea.
Bamber was brought up & lived/ worked in the area. Dark footpaths will not deter him.
He could always buy a bike light if he wanted.
There you go again no thought in what you post?
You give me a reference but you have no idea about what it contains, I have not read the WS but I know it was done in daylight and I suspect so do you. Cycling along a track in total darkness with no lights would not be easy.
As I said before your scenario should consider that JB does not want to get caught, you have him going up and down stairs multiple times moving SC around and leaving no tell tale traces behind.