Voyagers are used on the Bristol/Bournemouth to Manchester corridor, the Reading to Newcastle corridor and most of the Plymouth to Edinburgh services.
Turbostars are used on the Cardiff to Nottingham and Birmingham to Leicester/Stansted Airport routes.
A HST usually operates the 0606 Edinburgh to Plymouth service and 1523 Plymouth to Leeds, and the 0600 Leeds to Plymouth and the 1224 Plymouth to Glasgow. On selected days (can't remember which one, however, one works the 0632 Dundee to Plymouth and 1724 Plymouth to Leeds return and the 0632 York to Plymouth and 1524 Plymouth to Edinburgh).