I was just wondering what happens when Chiltern trains start public running between Oxford and Marylebone shortly. If I buy, for example, a cheap day return from Oxford to London, is it valid via either Reading or Bicester. If so, would it be valid out by one route and return by the other?
It'll be just like any oother journey that can be made via two routes.
If it says "Any permitted", it will be valid via BIT or
RDG‡. If it says "Chiltern Only", only via BIT. There can't be a "Via Reading" ticket, as
GWR▸ can only set the Any Permitted fare, as they are (currently, and I can't see them giving this up, can you?) not allowed to undercut that fare.
From London to Bicester are fares the same to Bicester North as Bicester Village via Reading or High Wycombe?
The fare from London to BIT is only routed via HWY, and you won't be able to buy any other routing. So
MYB▸ only. Of course, there will be tickets from other
LTV▸ stations that will route via
OXF» , but not London. If you want to travel from
PAD» to BIT, you'll need another ticket (either from Islip, I haven't checked London/Islip routings yet - or OXF) to get you there.
Will fares from Oxford Parkway be the same as from Oxford [Botley Road] station? Does the Botley Road station acquire a suffix to differentiate it from Parkway? I don't think it has ever had one before, even when the LMS▸ had Rewley Road station next door.
No suffix, one is OXP & the Botley Road station is OXF. You'll need to check the journey planner as I don't know. Nor have I checked whether OXP routing from London is via HWY only (it may well be) or valid via OXF.
Too many questions . . .
Not really, and all solvable with the journey planner