Matt, If I recall correctly, did you not post a web address for the company on your blog? (One quick web search later...) http://www.houseofcheviot.com/index.html.

The site lists their contact address as:

The House of Cheviot Ltd
Block 4, Units 6-8 Galalaw Business Park
Hawick
Scottish Borders,
TD9 8PZ
Phone +44 (0)1450 378 670
Fax +44 (0)1450 377 637
Email: sales@HouseOfCheviot.com

It might be worth making a quick call to see if they will sell direct, or can list some UK retailers who do the full colour range.

Best regards