The Carvair was a modified DC-4 with a new nose, and if memory serves, a DC-7 fin...
Modified by Freddie Laker's Aviation Traders. Sadly most have been scrapped now, but there are at least two still flying I think, one in Africa somewhere and the other in Georgia.
Returning to the Bristol Freighter, I've read on another forum that a Freighter is coming home to Blighty to replace the one that sadly crashed at Enstone in '96... anyone know more?