adywan said:
They broadcast episodes 4 & 5 1997 SE version on ITV1 a couple of years ago but they switched to the 2004 version of ROTJ because ITV HD had just started and they wanted to show it in HD. The 1997 versions were cropped though to 16:9 to fill the screen so weren't really any good to archive.
I am not sure if this will help but according to this video - http://www.youtube.com/watch?v=LilnZm2Judg - it seems that 97 SE version of Return Of The Jedi was broadcasted on German SAT channel Pro7 about three years ago. So maybe this could be a possible HQ source of 97 SE ROTJ. What do you think about that?