Little more info: the artist was Terry Patrick. His drafting style is wonderful, more old time British book/print illustration than "comic art" (by that I mean it's very close to the engraving style, shading with hatching, no sign of dots or half-toning).
I very much like the style of this particular period (late 1950s). It would have seemed "old fashioned" even then, and differs from American comic conventions in lots of way that make it closer to an illustrated book (note, for example, the typeset rather than hand lettered text and the unusual layout)
The Black Sapper had a very long run, from the '30s or 40s on. He's a bit of a curious villain/hero, hunted by the authorities as a criminal, but a friend to the common man.
Am I mistaken in inferring a slightly political message? The coal miners were famously lefty-socialists, perhaps theres a bit of a message in it?