If it's an any train ticket (peak or off-peak), and not the last train on the route of the day, you can just select the next train and appropriately set the ticket type if the next train is off-peak and you need a peak train. However requires a bit of rail ticketing knowledge for that.
I remember during some of the GA strikes, some of the "guards" mentioning the ability of buying the ticket on the mobile app as they couldn't sell tickets, yet hadn't take account of the above issues.
I remember during some of the GA strikes, some of the "guards" mentioning the ability of buying the ticket on the mobile app as they couldn't sell tickets, yet hadn't take account of the above issues.