I'm posting this question here because it involves the Government Tartan albeit that the question is principally about the regiment. Mods - please feel free to move this eslewhere if it would sit better in another section.

Does anyone know who exactly the Britons (North) (Loyal) Volunteers (Middlesex) were?

That is the regimental name associated with a uniform in the collection of the (UNational Army Museum that belonged to Capt Alexander G Davidson who became a Lieutenant in the Regiment 15 Jul 1803 and Captain on 24 Oct 1806. The uniform is Highland (box-pleated kilt, sporran and knitted hose). I'm assuming that he belonged to the North British Loyal Volunteers but the use of 'Middlesex' in the title is confusing as is the exact identity of the regiment.

I've asked the question on a military forum and the only reply, which I think unlikely, was that Sounds like he purchased his commission and raised his own Battalion, so he may have dressed them as he saw fit. I think they could have been based around Kingston. Kingston is Kingston on Thames in Surrey. Black Watch Officers were sometimes referred to as Surrey Highlanders but that's for a completely different reason. I really cannot see a regiment raised outside Scotland during the Napoleonic era wearing Highland Dress.

Any thoughts?