Thanks Typo,
It would appear as though somewhere within the YouTube URL, is an actual location, from which you can initiate a download. I've read that YouTube regularly change the method of hiding this link. A lot of CAC's code is spent on getting this link using RegExpr.pas. I noticed a similar approach in a Delphi.
From a learing perspective, I'm going to look more deeply into how this is accomplished.
When I tried CAC, it failed to download, so in the 8months since the last release, youtube have changed their method again.
However, apart from hiding the link, the actual method of download is accomplished with Synapse.
Thanks for the help.
Regards