Agreed - there were persistent problems and cancellations before the cold snap. The resignation of the MD seemed to have been brewing for a few weeks... It strikes me that there is more to it than just the cold weather.
I wasn't on board (a colleague was) the shortened service from DON-KGX last night which lost a lot of time, indicating their only working unit possibly isn't in the finest of conditions either, though of course there cold be lots of other reasons why it lost time:
http://www.realtimetrains.co.uk/train/G11016/2018/03/12/advanced
I think what is really putting passengers backs up is the lack of ticket acceptance on VTEC and the "go via sheffield" option, which takes over 4 hours. People will always complain, but if the sentiment on twitter is anything to go by, it is regarded as apparent penny pinching, and an unnaceptable solution.
Still one unit today? Perhaps it's time to rename them Hull Train. Who needs the S anyway
Usual caveat: The hard working frontline staff are fantastic as ever and have my sympathy.