Just came across this gem in my research, it may be of use to others (in fact many books on that website look interesting)
The Migrant Caper
Although it's mainly focussed on the 1947-49 period there is a footnote for 1950-60 of which they cite Britannia charters were mainly used for the immigration runs to Australia. However, according to the article, even clapped out DC4s were being used from Yugoslavia/Hungary/Czechoslovakia to Australia.