This is a welcome venture that will do wonders for supporting the Harris Tweed industry. It does though raise an interesting question about what is the difference between tartan and tweed. In the early C19th Wilsons of Bannockburn also sole ain coloured tartan; i.e one or solid coloured.

Given that one can weave a pattern, or otherwise, on both types of cloth I've always made the distinction that 'true' tartan is woven from solid coloured yarn whereas tweed is woven from a mixtured yarn. Thus, the original Balmoral was in fact a tweed and not a tartan. Ditto the Elcho/Hodden Grey.