Thats virgin did last week when there was a shortage of voyager, they spotted hired some EWS Class 90 (or maybe 91s?) with MK2 coaches from 1971.
Them MK2 coaches are like being on a roller coaster they are so jerky, MK3s are so much nicer. Never been on a MK4 because they mainly run with 91s on the East Coast line.
On the west coast nothing can beat a Pendolino because of the curves, HSTs are to slow to get up to speed so every time they go round a bend it reduces the speed and takes ages to get it back up. Pendos can accelerate much faster and can go much quicker round the bends.
Apparantly somebody was sacked at Virgin for making the decision for the Voyagers to have 4 cars 