On Twitter, Richard Clinnick of Rail magazine has insisted that only 17 of the 26 West Midlands 323s are due for Northern, at least for now. He claims that Northern "would like" all 26.
I can't see any reason for all 26 to not go to Northern, other than a lack of available work for them. Surely Porterbrook would rather have the future of the entire class secured?
I can't either, particularly as I don't think it'd be very easy for Porterbrook to find a home for what would be a micro fleet of nine 323s.