I am currently at Stockport. I am travelling to Milton Keynes Central via Crewe. I have a ticket that is valid only on Northern services from here to Crewe. There is currently no Northern train running in that direction due to a major fault. I have asked the station staff if Virgin Trains are accepting tickets. They've said there's currently no ticket acceptance in place for Northern except with TransPennine Express, and that is only available between Manchester and Manchester Airport. There is a VT service going to Crewe which would see me arriving on time. TfW passengers are allowed to board the VT service to Crewe and change there. But Northern passengers are not. Why not?