Interesting and hard to prove one way or the other. How would the TOC even know that you were there for the 1700?Absolutely
But I’d be intrigued to know whether any of the DR claims that GR have pushed back on based on tap in data for this sort of scenario.
Normally get the 17:00 but it’s cancelled
Go to the shops / pub, end up being a couple of hours
Get the 20:00
Note that the 17:30 ran on time so claim 30 minute DR
GA say “hang on a minute pal, you were on the 20:00 and it was on time, pay up or we’ll see you in court”
I must admit that most of my claims have related more to delays in journey (e.g. cancellation of connections or missed connections due to delays) than to delayed start of journey.
I did, due to refusing to sit on a freezing cold station for an indeterminate length of time awaiting line reopening once trespassers were cleared off the line, miss the first train that ran and caught the second. I clearly annotated the paper claim form to this effect and LNWR happily coughed up. I was though travelling on a paper ticket on a station without barriers.