The iso has been successfuly repaired . I copied it into the Bittorrent destination folder and when I next saw the progress it was at 78%, so all that had to be done was d/l the remainder. Worth remembering.
Now I need to sort out the next list of issues...like the Xserver (I have an intel 82865G Integrated Graphics which doesn't seem to be supported), but isn't that what Linux is there for.....tweaking