Northern Fail's app is, unsurprisingly rubbish. Net connection required not access ticket details. No net connection at most gates.

In this case, it's repeating the old "randomly refusing to display the QR code" Error. Today, at least, the guy on the gate let me through. Some jobsworths won't, despite the screen showing date of validity and to and from stations.

What would I do if the gate wasn't manned?