So my trip to Canterbury was postponed and now I'm looking again at the ticket restrictions (for a different travel time). According to brfares.com, an off-peak return from Reading to Canterbury is not valid on (amongst many others) the 1902 from Paddington to Bristol Temple Meads; however, the "unpublished restrictions" on that same site only include (as the latest) departures from Paddington between 1857 and 1859 on GWR, and indeed the National Rail Enquiries website suggests a plan which involves taking that very train! Am I right to assume that my ticket will be valid on any journey shown on the NRE website, regardless of what the ticket restrictions may say? I suppose the real issue is which takes precedence: the list of specific trains (some of which have been retimed) or the unpublished restrictions that online journey planners use?
And given the "action short of a strike" next week, what is the position if the train that my ticket is valid on is cancelled or delayed - can I just take the next departure regardless of whether the ticket would normally have been valid on it, or would I have to wait?