Effectively, yes. That is why your story - which involves a very conveniently timed, self-deleting message - is unlikely to be believed if this case gets as far as court.
And also why most TOCs are investing in ticket machines and barriers where they can, in order to close this (and other) loopholes that collectively result in many hundreds of millions in lost revenue.
the deleting part was due to other problems and I could ask my friend for screenshots. If it is just the case of proving that there was a plan on that day and it was changed later during a time roughly about when I was on my journey then I should have no problem.
However I have no way of proving when I actually read the message do I....
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We are going off topic somewhat but yes, that is possible, or there may not be many boarding at Oldfield Park and the RPI remembers exactly who boarded there.
Obviously there are other ways the railway companies use to catch fare evaders, such as the station blocks and the token system some companies use, where everyone boarding at certain stations (usually short-fare hotspots) would have to pass manual barriers to either collect a token and or be sold a ticket, so anyone claiming to have come from those stations but not in possession of a token or a valid ticket would obviously be lying and give the train company solid evidence of intent to avoid paying the correct fare, hence highly likely a criminal record should it go to court. The random nature of these blocks also add to their effectiveness.
I don't think it would be relevant to your case, only the fact that such a mechanism exists. If you are interested in further reading, I attach a copy of the Excess Fare Procedures for over-riding for your reference. Note that there is also some leeway regarding the interpretation of "opportunity to pay" before boarding.
Thank you for the document - I shall read it
Bath spa and oldfield park are really just walking distance apart. Thanks to the lesson taught by the train company, in the future I'll just walk up to oldfield park train station and catch the train there. Until they install ticket machines at oldfield park I'll be waiting for my opportunity to get a ticket on the train.