I seem to be on the mailing list of the AEC Society, and they have posted this request, so on the off-chance that it may be of interest, I'm reposting it here:
A chap from Australia is visiting the UK in September and has asked if there is an AEC Reliance 505 that someone would let him drive:
http://middx.net/aec/bb/viewtopic.php?f=6&t=1560