Hi there,
Same happened in the US, the late 30's White busses had been running forever in the Glacier National Park, and were just falling apart! but Ford came to the rescue, and so the bus bodies were put on a modern LPG running Ford chassis and engine!
Shame the White/Volvo Co. didn't get involved!! (edit, Volvo is owned by Ford now, so they did!)
See also here:
http://http://www.seriouswheels.com/cars/top-1930s-White-Glacier-National-Park-Red-Bus.htm
And a video:
http://www.youtube.com/watch?v=DYuszWB8l8w
Cheers,
Lex