Nothing will change in the short term on the basic issue of driver shortages, the trains will still run (or not) and existing bookings honoured.
I was due to travel TPE on Saturday, and was just happier at getting a through ticket to Manchester than a Preston change (at a stupidly cheap price), and likely more room than on Avanti. As it is I am now on Avanti due to the strike.
But oddly TPE are running buses from Edinburgh to Carlisle on a strike day, when Avanti are running nothing from Glasgow- bus or train.
I knew that if there was a cancellation I would have had ticket acceptance of my advance ticket on the next Avanti train anyway.
Northern are worse than TPE at the moment- twice in a week I have had a northern train from Manchester just vanish from the timetable- not cancelled, just removed. The latest case was this Tuesday- and I have locked horns with Northern on a delay repay case for last week. That is happening on Northern frequently and all over the network currently.
Depending on when you got to Preston it could be Avanti either to Glasgow or Haymarket/Edinburgh.
1 June is the day after a strike and Northern are already warning of continuing disruption that day.
I would just take the easy route and fly to ABZ, then train back to Dundee.