Marton Mills 12 oz. Polyester/Rayon blend fabrics go by the name Balmoral.

They are found under the schoolwear tab on the Marton Mills site.

The variations on the Thompson Tartan that they weave are;

Thompson (M/Camel) BA139T Equivalent to ITI # 2421 ---- Please do not confuse this with Burburry.
Thompson (M/Grey) BA027T
Thompson (Grey/Small Sett) BA145T