Hey FA, only problem I can see is whether an Evesham routed ticket would be allowed on the diverted service, as the route Evesham or Stroud is not available in conjunction with a Network Railcard. I would fire off an email to FGW▸ and use words such as regular traveller, goodwill etc and print off any favourable response.
From my whistle-stop research you can get a NSE▸ discount on the via Evesham, via NOT Birmingham and via Any Permitted, but not on the via Evesham or Stroud.
I would therefore imagine, as you're not breaking the journey, that a Not Birmingham ticket would be valid, even if an Evesham one was not.
What I fine - not just during the blockade but on similar services when engineering happens - if its even vaguely valid, no one on FGW questions it. I went via NWP for the six weeks on a
WOS» -
RDG▸ ticket and only paying a lUD-
HFD» excess to cover the arriva section. Was WOS-RDG via NWP valid - who knows - but I think it was only questioned once.