
Sorry Andy, but the DLR has always run with a member of staff on board since services began in 1987 - and yes I travelled on the system that year. The on-board member of staff was originally titled a "Train Captain" and they are now called a "Passenger Service Agent".
Please see this English Heritage Survey of London chapter on the Modern Docklands - or if you don't want to read it all just perform a text search for "train captain":
http://www.british-history.ac.uk/report.aspx?compid=46546
If that ain't good enough have a gander at this article on the DLR ATO signalling system on the Railway Technical Web Pages:
http://www.railway-technical.com/Sigdock.shtml
Lastly, a simpler short piece on TheTrams website about the DLR:
http://www.thetrams.co.uk/dlr/
The whole system had a very long period of teething problems such as the one you describe, which was unfortunately not uncommon back then.
However I can give you a cast-iron assurance that each and every DLR train always does and always has carried a Train Captain/ PSA - apart from this instance (and perhaps a few other similar instances) when the train has let slip its leash and run off without the PSA.
Please feel free to attempt to prove what you say - but you won't be able to, because it is erroneous. Sorry to be harsh, but that's how it is.