I posed a question on the RT Technical forum about bicycling of prints. Paul Vanezis replied that he will post details on that once he has finished his research. This would be very useful information (though probably depressing news). For example, if it is known for a fact that the Singaporean prints were shipped back to the UK, there would be little point in looking for those 16mm films in Asia. At most, there could only be 8mm off air footage or early domestic videotapes, but again this is unlikely.
In any case, more information about the bicycling of prints would certainly let us know better where and how publicity of the missing episodes should be directed.
The text appears below. Paul gives the distinct impression that records seem to indicate that most materials were returned to the UK (such as from Singapore) and then junked. However, he does mention South Korea, Hong Kong, and Uganda as destinations of bicycled prints and Japan as a recipient of missing color (i.e., Pertwee) episodes. This gives us some clues, but we will need to wait for Paul to reveal details.
I think people seem to forget that most material was returned to BBC Enterprises and junked locally. There is far more evidence to support this than tins of film lying in Singapore. I agree though that knowing more about the bicycling system would give us a better understanding about what MAY exist outside of the UK in foreign TV libraries (not a great deal if any IMHO).
Anyway, I am in the middle of a programme of research to collate all sales information, which will include the sales to Korea in the early seventies that have been forgotten about, colour material in Japan etc... and update any bicycling records such as those from Cyprus to Hong Kong/Uganda.