Ok.
I did a quick Google but didn't find anything specific but point noted.
Quite, and what I've deal with so far.
As I mentioned elsewhere, if there is a 'bigger picture' with these BD's I'd like to get it and then there might be less poke-and-hope. ;-)
I've now got a file that seems to work with the default settings of VLC on a different PC to the one I created it on and so I'm fairly confident it should produce a useable DVD.
Cheers, T i m