@AdamY
It would still be worth sending round the Old Fold, but I would miss out the section between Neilson Road and the college. Never seen it stop at any of the those stops beyond 9pm, unless there is a match on.
Another underused portion of a service on a night is the Gillas Lane section of the 20. Maybe worth alternating the half hourly 20, so that one does the 20 route, the other the 20a. The 20a couldn't pick any fewer people up than the 20 does at times and could be timed to alternate with the 4 along Dairy Lane.
RE: Go North East Service Suggestions
'Illegitimis non carborundum'