(11 May 2021, 3:59 pm)GNE6312 wrote Would have thought they'd priorities getting the 91s on their flagship Edinburgh to London Routes.

Surely they'd want their new trains on their 'flagship' route? 

Regardless, I'd imagine there'd be issues with crew competency and maintenance at Craigentinny and Heaton. From memory, and I could be wrong here, I don't believe there were any plans to have 91s serve Newcastle/Edinburgh again, with the plan being to use them on the Yorkshire runs.