I was able to open the PDF document, so I don't know what the issue is to help on your end, BoldHighlander. Although it seems to have a bunch of spaces missing between words and is difficult for me to read; not sure why.
I went to the root directory of the address of that document and looked under Peter's research link for all of his articles. You might try opening it from that page. Here is the link, it's part way down.
http://www.scottishtartans.co.uk/research.htm


Hope it works, and there's a bunch of other articles you will be interested in, as well...