I don't have any proof, and it's probably my memory playing tricks on me. But, I think I remember seeing some (1 or 2) of the 47/7s at Waterloo when they first started on the West of England trains still with, scruffy, Scotrail branding but obvously it didn't last long. I didn't take too much iterest in the 47s then as they weren't 50s!! I have often wondered, "what if" the complete push/pull trains had come south instead of just the 47/7s!
David