Our booking engine at tickets.railforums.co.uk (powered by TrainSplit) helps support the running of the forum with every ticket purchase! Find out more and ask any questions/give us feedback in this thread!
Without knowing any details myself, the move to Long Marston seems to align with Porterbrooks' new deal with St Mowden for the future of that facility.
https://www.porterbrook.co.uk/news/porterbrook-to-expand-into-long-marston
Many photo's of this working appearing in the twitter-verse. Forgive the potential ignorance of the question (i'm from Australia and therefore slightly unfamiliar) I'm surprised they're only going with 5-6 car rakes (not incl. DVT) considering Virgin/Avanti have been working Pendolino's into...