I had thought that the owner of Piper's Cove had designed and patented it and that HOE used it under liscense in their "Irish line" of fashion tartans...

When I checked 2 different sources online, I found this:

"Produced for Macnaughtons of Pitlochry in a collection of trade tartans, designed for ex-pat Irish by the House of Edgar.
The source of tartan 2245 was: Polly Wittering. House Of Edgar. "

(Keep in mind that "MacNaughton Holdings" is HOE). Not sure what the real deal is here... maybe Jerry from SW can elaborate.

Ireland's National is a COMLETELY different tartan.