Disconnect battery overnight to reset everything, positive off, and back on first...or was it the other way round...best check
The glow plug error was a new one in its history and we're now maybe a year down the line since it started without any issues so I think its safe to ignore for now, like the other daft random messages on the bloody things.
Reconnect battery in morning and then disconnect fuse (28 I think, whatever I said in previous posts) clean it up. Dont put it back yet (clean other fuses up at same time by rubbing with emery paper or fine sandpaper. Reconnect all those apart from 28. Try and start car without fuse 28 in it wont start but will go through initial motions..do it a couple of times. Take key out and replace fuse 28..et voila that was my final fix and lasted me quite a while, and you clearly until things started again....