There was a London Country Atlantean reroofed with a DMS roof, but can't recall which one.
Also Metrobus added a standard ECW Olympian front to a former Thamesway Olympian double deck coach, for, I believe, consistency reasons rather than any accident damage. https://www.flickr.com/photos/68359129@N02/50136661806/in/photostream/
(Apologies for poor photo; photo shows B688BPU, a Leyland Olympian ONTL11/2R5P ECW CH45/28F purchased from Thamesway for private hire work parked up amongst other buses at the Green Street Green depot)
Also Metrobus added a standard ECW Olympian front to a former Thamesway Olympian double deck coach, for, I believe, consistency reasons rather than any accident damage. https://www.flickr.com/photos/68359129@N02/50136661806/in/photostream/
(Apologies for poor photo; photo shows B688BPU, a Leyland Olympian ONTL11/2R5P ECW CH45/28F purchased from Thamesway for private hire work parked up amongst other buses at the Green Street Green depot)