The English Civil War: 1642-1651.
by R. Potter and G.A. Embleton (1973).
I found this little volume* at Powell's, and as it's nicely printed on glossy paper and has lots of 17th century illustrations throughout, it seemed worth the pick-up. This is what I call a "museum history book", in that the text wanders from one topic to the next with no transitions, rather like walking from one room of a museum exhibit to another, so, for example, in this room we find samples of mid-17th century English women's clothing, and in this room a little bit about various firearms, and in this bit some pretty flags, etc etc. In the end, I found this volume quite enjoyable, since I like finding out about the little details, and the "Big Story" elements are thankfully absent (especially as they are covered exhaustively elsewhere).
*Just 96 pages and that's counting some pages that might as well be blank.