If you decide not to travel and seek a refund, you get it from the seller of the ticket, LNER.Thanks for the helpful reply - its a good point that I will now be taking a coach anyway, so could have gone on the WCML after all. Unfortunately zero availability for any advance fares, so its £108 cheapest one way now standard class! Guess I'll stick to LNER...
Who do I seek reimbursement from? Scotrail whose services are impacted or LNER who sold the ticket?
If you travel and are delayed by more than the threshold time, you seek compensation from the company whose service caused your delay, namely ScotRail.