I'm a US Brannock L: 9.5D, R: 9E, and my feet are fairly high volume. I like an 8-1/2, Fitting 5 or 6 UK in the 4497 last. I usually wear thin socks with an insole or thick(er) socks without an insole.
There were several that ended over the weekend, but I don't think they ended early. They were mostly unique makeups, too, with two vastly different leathers. The sizes were mostly 8.5 - 9.5. Several of them didn't sell, so I'm sure they'll be relisted at some point.
I love me some c-shade gorse! My Malton Commandos (bought them from Carson, actually) are my go-to boots for bad weather and casual outfits. Here's a pic from today. I've really only performed minimal maintenance, such as brushing and shoe trees. The leather doesn't seem to need much conditioner, and it's maintained a consistent and satin finish. The leather isn't particularly thick, but it seems tough enough for regular casual wear.
I'm a big Rancourt fan. I just got some green Ranger Mocs from the recent Brooks Brothers sale. I ordered them TTS, and they were a bit tight to begin with, but now they feel like leather socks. I also have 2 pairs of Trask branded Rancourts. One pair is a bison chukka boot, and the other is a wool and whiskey cavalier boot.
I'm a 9D/E Brannock, 8.5 Barrie and an 8.5-fitting 5 UK in the 2298 last fits perfectly. The 2298 last isn't particularly narrow - it's just a bit sleeker in the toe-box than the 4497 & 4444 lasts. So, I think you'd be good with an 8 UK.
It's just my opinion, but I wouldn't pair dark brown boots with black jeans, unless your Stows have a light/natural welt to provide some contrast. Lighters shades of brown might look ok with black jeans, though. I usually try to have some contrast between my shoes and pants. Tan shoes with brown/olive pants, brown shoes with khaki pants, brown/tan shoes with navy pants, etc.