OK, we've sorted Q1 now - for some reason it is being very picky about cables.
Although it wouldn't do RGB from the digibox with the 1 cable that was giving RGB from DVD OK it will with another cable that I've borrowed
Btw, for those who asked I did say in my initial post that I had already set RGB in the digibox setup (had also set 16:9 which I failed to mention) & that my TV had 1 RGB enabled SCART plus 1 other SCART. :pp
Thanks for the help/support anyway guys.