This is the point I am trying to make "Spike" If Wigan came /comes under Greater Manchester Police , maybe at the time the force was much more focused in other areas. like the city itself ?
I was working and living in Manchester city centre in 73 and I used to hear things on a regular basis at work about areas like "Moss side" for example getting a lot of force attention , plus there was the city centre to control.
Maybe because there wasn't any reported crimes ...they left Wigan alone ... its just a theory ... and I would have thought a reasonable one at that ? ... I really don't understand your get real remark