[QUOTE=M. A. C. Newsome;977648]This tartan was originally designed in 1982 by MacNaughtons (House of Edgar). The original version did not have the green lines.

In 1992, in their book District Tartans, Gordon Teal and Philip Smith say that the tartan has "recently been woven" by Lochcarron with a change in color, which I would assume is where the green line version was introduced.
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I cannot see the images on this machine and so can only comment in general but so far as the original Arran is concerned; many years ago the STS had a double width merino plaid c1860-80 in this sett so I think that Macnaughtons revived rather than invented the original setting.