That dates back to 1979 at least, and it was a bold venture for Hornby at the time. I think the list price back then was about 200 quid. There were matching S&D coaches to go with it, and they had opening doors. Can't remember list price of those, but £43.50 each sticks in my mind for some reason.
Rocket and its coaches were still in the catalogue for 1981, but I don't remember seeing them after that year.