Basically, if I wanted to use an any-permitted ticket (specifically a season ticket) between Cherry Tree (my new local station - nearest routeing point being Blackburn) and Manchester, I wanted to verify whether going via Todmorden (i.e. the scenic route) is a permitted route (I already know going via Blackburn-Bolton and via Preston are both valid on the season ticket but via Todmorden is uncertain), as Manchester Group to Blackburn only shows MH, which shows the route via Bolton only. However, the MH map shows Accrington as a 'routeing point', so does that mean Accrington to Manchester Group also applies with the MH? That would then allow BM+DP which means the Todmorden route in this case. Screenshots shown below of the relevant routeing information (maps and yellow page entries).
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I think you may have slightly the wrong end of the stick here.
When it comes to determining mapped routes, you must first find the appropriate Routeing Points. In this case, Blackburn and Preston are the RPs associated with Cherry Tree. Manchester Victoria is a member of the Manchester RP Group.
Blackburn passes the fares check but Preston fails it, as the fare from Preston to Manchester was higher than the fare from Cherry Tree to Manchester in NFM64 (1996). Therefore we can only use mapped routes from Blackburn to Manchester, and we cannot pass through Preston (even if this happens to be on a map from Blackburn to Manchester) as Preston has failed the fares check.
You can only use the maps indicated in the Yellow Pages as applying between the relevant RPs - in the case of Blackburn to Manchester, the only map is MH. It's irrelevant which maps you could use from other RPs that feature on map MH - the Routeing Guide isn't recursive in that way.
As you can't trace a mapped route from Blackburn to Manchester via Accrington and Todmorden on map MH, it's not a mapped route.
To be honest, I can't see any point to having separate "via Bromley Cross" and "Any Permitted" fares for this journey, seeing as the only permitted route appears to be via Bromley Cross, even on the Any Permitted fare. There are more expensive "via Preston" single and return fares to allow travel that way (but unfortunately no season tickets).