This is outrageous, a journey cancelled through lack of a guard when it's supposedly drivers Northern are short of. This is the greatest argument for introducing an emergency timetable, i.e. at least then optimum use could be made of available drivers/guards/rolling stock.
Why is it?
There was no guard because the guard might have been travelling pass on a train that was cancelled, or supposed to work another service that was cancelled due to no driver.
Example:
Service from Manchester Oxford Road - Liverpool, cancelled, no driver.
On arrival at Liverpool, the guard does a trip to Wigan.
However, because the service was cancelled the guard has to catch the next service to Liverpool travelling passenger arriving into Liverpool late.
This means the Wigan departure may have a driver but now has no guard so is delayed leaving Liverpool.
On arrival at Wigan the guard is booked a 20 min break before going back to Liverpool, however as the guard was late inward and claims their break, this service is then subject to a late start and so on.
You can see, how the situation snowballs, and why there has been so many delays.