Which is fraudulently claiming delay reply if he put on the claim he was on the later train.
I think the Northern form asks you to type in the origin station, destination station and then select the date and time. You then have to select your intended journey and the delay you experienced from pre-selected options. You don't get to type anything else in unless you select 'my journey isn't listed'.
So in theory, your intended journey could be:
Departure: 15:00
Arrival: 15:30
But it was cancelled, so you catch the 14:00 instead of the 16:00. However, the 14:00 actually departed at 14:27 and arrived at 15:32 due to an infrastructure/train fault. You could answer both questions truthfully on the Delay Repay form and it would probably be accepted. Even though it would probably be based on you catching the 16:00, rather than the 14:00 arriving over 60 minutes late.
Given they've taken people to court over 5p in the past I wouldn't find much consolation in that.
The cancellations are a pain in the backside and poor. But what I'm saying is don't let them get back at you. Look at Greater Anglia - they contacted people a year later and threatened prosecution if the delay repay wasn't repaid with an admin fee. Is it worth it for submitting an untrue claim for £1?
If it was one of the £1 sale fares, I doubt many people would choose the cash option for Delay Repay when there's also the option of a complimentary single Northern only ticket. The value of these is unclear, especially if it ends up being used on a route with multiple operators where there's not a Northern only Anytime Single fare.