Some speculative thoughts regarding the southern routes, which I am more familiar with:
- Glossop – Hadfield – Piccadilly
- Rose Hill – Piccadilly
- Buxton – Piccadilly
- Alderley Edge – Piccadilly
I am wondering whether, in fact, all EMU services through Stockport should become part of the "Bee Network", so that everything from Heaton Chapel and Levenshulme is part of the system and that the whole set of routes could be operated with the same fleet of EMUs, allowing interworking. Granted this would mean "Bee Network" services going out all the way to Crewe or Stoke but I guess that's only like 455s or EPBs, two classes thoroughly associated with Greater London, penetrating into deep rural Surrey and West Sussex by calling at the likes of Ockley and Warnham. The "Bee Network" ticketing system could still be restricted to GM if need be.
I also wonder whether not only the Rose Hill stopper but also the Marple/New Mills terminators (if they still exist, my experience on this line was wholly within the 90s) could also become part of the network. If anything, they seem to be more part of it than Buxton would be, as the latter reaches deep into Derbyshire and is more comparable with the line through Knutsford, if anything.