I am aware of the following routes from Stockport to Cambridge that I would consider reasonable (and that have popped out of journey planners at one point or another)
Stockport->Ely (EMR)
ELY->Cambridge (Various operators)
Stockport->Doncaster (TPE)
Doncaster->Peterbourough (LNER)
Peterbourough->Cambridge (Crosscountry)
Stockport->Nuneaton (AWC)
Nuneaton->Cambridge (Crosscountry)
Stockport->Birmingham NS (Crosscountry or occasionaly AWC)
Birmingham NS->Cambridge (Crosscountry)
Stockport->Doncaster (TPE)
Doncaster->Stevenage (LNER)
Stevenage->Cambridge (Great Northern/Thameslink)
Stockport->Euston (AWC)
Euston->Kings Cross/St pancras (Walk or tube)
Kings Cross/St pancras->cambridge (Great Northern/Thameslink)
Stockport->Euston (AWC)
Euston->Finnsbury park (tube)
Finnsbury park->cambridge (Great Northern/Thameslink)
Stockport->Euston (AWC)
Euston->Tottenham Hale (tube)
Tottenham Hale->cambridge (Greater Anglia)
According to online journey planners, all of these seem to be permitted routes except the one via Doncaster and Stevenage.
This leaves me with a couple of questions.
1. Why isn't Doncaster and Stevenage a permitted route? Initially I thought it was the short doubleback between Hitchin and Stevenage, but forcing a route via doncaster and hitchin and avoiding stevenage doesn't seem to be valid either.
2. Given that all the reasonable routes I have found other than the one via Doncaster and Stevenage go via either ely or London, what is the point of having "not london" tickets.
Stockport->Ely (EMR)
ELY->Cambridge (Various operators)
Stockport->Doncaster (TPE)
Doncaster->Peterbourough (LNER)
Peterbourough->Cambridge (Crosscountry)
Stockport->Nuneaton (AWC)
Nuneaton->Cambridge (Crosscountry)
Stockport->Birmingham NS (Crosscountry or occasionaly AWC)
Birmingham NS->Cambridge (Crosscountry)
Stockport->Doncaster (TPE)
Doncaster->Stevenage (LNER)
Stevenage->Cambridge (Great Northern/Thameslink)
Stockport->Euston (AWC)
Euston->Kings Cross/St pancras (Walk or tube)
Kings Cross/St pancras->cambridge (Great Northern/Thameslink)
Stockport->Euston (AWC)
Euston->Finnsbury park (tube)
Finnsbury park->cambridge (Great Northern/Thameslink)
Stockport->Euston (AWC)
Euston->Tottenham Hale (tube)
Tottenham Hale->cambridge (Greater Anglia)
According to online journey planners, all of these seem to be permitted routes except the one via Doncaster and Stevenage.
This leaves me with a couple of questions.
1. Why isn't Doncaster and Stevenage a permitted route? Initially I thought it was the short doubleback between Hitchin and Stevenage, but forcing a route via doncaster and hitchin and avoiding stevenage doesn't seem to be valid either.
2. Given that all the reasonable routes I have found other than the one via Doncaster and Stevenage go via either ely or London, what is the point of having "not london" tickets.