Avanti West Coast (London Euston to the West Midlands, Northwest, North Wales and Scotland) Train Managers (called Guards or Senior Conductors or Conductors elsewhere on the network) have voted to strike for three days around Christmas over rest day rostering - because of the shortage of staff they are being made to work overtime to keep the trains moving. They are unhappy with the way that is done. They usually work a 41 hour work week and are being asked to work on their days off.
So they will walk out on Sunday and Monday the 22nd and 23rd of December and on Sunday the 29th of December.
Trains need Train Managers in the train and Drivers on the front. It is possible that some trains will be worked by managers and it is unclear the actual impact.
Check before travel. Updates will be posted when and if there are any.
There are slower trains paralleling on much of the their routes, but it will involve a degree of patience, planning and flexibility to travel on those days and those surrounding.