Which documentation are you referring to when it suggests they must get you there?
As far as I was aware the parts of the NRCOT that talk about this talk only about completing a journey. This implies the journey has started.
I don’t see an issue with the ‘where it reasonably can’ clause here as this to me would only come into force in situations where they simply cannot get you there, for example severe weather, but this to me suggests that if you haven’t started your JOURNEY (taking 14.1 into account) then you might not be eligible for this, other than a refund from the point of purchase.
It is my view that if you had previously purchased a ticket with a reservation and/or itinerary for a selection of trains to get you there and one is cancelled then they must get you to your destination. If it’s a single train so you do not start your journey then I think it’s more of a grey area. Perhaps if it’s part of a return ticket with an itinerary and/or seat for both legs then there is some ground for them to take action. However purchasing a ticket on the day is just going to end up in a debacle.
@ForTheLoveOf by all means try this out if you feel it’s necessary and you have the time, I’ll even buy your ticket for you if it’s sensibly priced but I think there has to be some common sense applied. There’s a difference between not being able to make a journey due to strike action and being genuinely stranded part way home due to strike action on an advance with connections ticket booked in good faith.