Grand Central to Blackpool isn't too surprising, the Intercity 225s will just need a repaint and change of colours inside. Looking at Sunderland, although it started with HSTs they got ditched when 180s became available, another case of multiple units being more popular.Absolutely. See also Grand Central to Blackpool and indeed Grand Central to Sunderland back in the day (those HSTs had no other home when they brought them into service) all using spare stock which had no other home.