Avanti train from Euston cancelled, getting the next one delayed me by 30+ minutes.

My avanti train was cancelled so I had to take the next avanti train which left 20 minutes late and arrived 25 minutes late. My compensation given is 25% of the ticket price, but since J arrived at my home station more than 30 minutes late (had to take a different regional train in birmingham), am I entitled to 50% delay repay?

Is there a way to explain this case to the delay repay team in any appeal?