I looked at live departure board for Chester last night. It gave the status of the 22:56 for Holyhead as 22:39 (or something like that) instead of being on time or anything like that. I then checked on realtimetrains, and it was shown as having left Chester 17 minutes early (again, I don't remember the exact number). When I got to the station, the train was listed as "delayed" on the board by the platform (the main board was displaying something about strikes instead of showing the next few trains, so I didn't get to see if that tallied). I looked later on, and it was listed as "on time" on live departure board, and similarly on realtimetrains (I notice that this shows a different platform to the one actually used, but that's not unusual). Is anyone able to shed any light on what was going on?