Yeah DM was huge back in the day, but the town they made them in (Northamptonshire) was historically the centre of shoemaking in the British Empire, lots of manufacturers were there... Solovair was one of them, and they made lots of boots for DM but also their own stuff.

Alternatively, something like Redwing Iron Rangers is way higher quality. Or in the US style but more affordable, the Thursday boots are pretty decent too.

And lately I really love Jim Green. Amazing quality for the cost, and they seem to be a very transparent company with some good goals. They even show the whole production process. On those boots everything is both glued and stitched... These are actual work boots in SA, not the heritage or classic fashion boots they sell in the US or Europe nowadays.