Here's what the Scottish Tartans Authority says about it...


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Notes:
Designed by Alistair Buchan of Lochcarron of Scotland to commemorate the Silver Jubilee of Queen Elizabeth II in 1977. See also Macnaughton version. Sample in STA's Johnston Collection. Additional notes from the STS say: "Holyrood is the Scottish equivalent of Buckingham Palace, the Queen's official residence in Scotland. She is guarded by 'The Royal Company of Archers', a non military force provided by the chiefs of the clans. A sample of the Holyrood tartan was presented to the Scottish Tartans Society by Lochcarron Weavers in 1980. Sample in STA Dalgety Collection.