A question.
I have a choice of several routes when travelling to London, the main ones being via Guildford, Reading or Wokingham. An Any Permitted ticket to London Terminals covers all of them.
But, due to the vagaries of NFM64 fare checking and the removal of the Farnborough routeing point* a few years ago (which has made matters a lottery), tickets to some destinations, but not others, beyond London are reported by NR Enquiries to be invalid if I use my preferred route to London (faster journey time, easier interchanges, more convenient links between London termini).
As the invalid route obviously is "valid" (to humans anyway!) I have never had any issues at gatelines or with on-board ticket inspections when going this way. However I've never used an eticket when doing this - is the scanning sophisticated enough to pick up I'm technically off-route?
*The removal of the Farnborough routeing point created an unholy mess that has never been fixed. Laughably, if I specify a ticket from stations either side of my home station then NR Enquiries happily declares my preferred route to London is valid. Aargh!