Me too. If we're talking European, the British workwear tradition in which you could place Howell, is a bit different from the French and others.
Revivalists in this vein include new fairly high-end companies like Nigel Cabourn, Old Town, S.E.H Kelly, slightly more affordable options like Cro'Jack and Universal Works, and rebrands of old producers like Private White V.C., and others who've never gone away like Macintosh, Gloverall and Barbour. Tends to go for (sometimes treated) canvas, cord and twills instead of denim. Less blue and more soft greens and browns. Flat caps not ball caps. That kind of thing. And of course, there are the shoe companies: Grenson, Trickers etc. What I like about British workwear, as you say, is that it shades into the world of heavy tweeds and such like. It's not quite as separate from tailored clothing as the American tradition.
There is a promising thread about this here, started by @ManofKent, who used to be the living embodiment of British workwear revivalism, although he's branched out since then: http://www.styleforum.net/t/220610/british-workwear-heritage-brands - but the thread has not been very active for the last couple of years.
The thing about UC is that he works in construction (or at least that's what his blog suggests), and a lot of the stuff (not all) that he wears wouldn't—it seems to me—work for someone outside of his trade. Of course, most of the world don't know and don't care what you do for a living.
Also, I think UC looks great and it's easy to extract from his stuff some of those "principles" you like so much, CM: nothing baggy, everything covering the torso hits around the belt-line (and certainly before the crotch), shirts rolled up to or above the elbows, jackets worn open and rolled out to frame the face, simple uniform patterns and some basic color theory. It helps, too, that he's an athlete's body.