What is the font in this extract?
(hint: I've already found that it looks very similar to Handel Gothic, but the M is round on top)
and what free (or even open-source if possible) font (to use in a printed book) could I use to replace it?
I actually decided to replace it with Roger White's Newtown: http://www.fontspace.com/roger-white/newtown:
I fixed the small caps by ``thinnering'' the font as explained here. The small caps have been adapted to the height and width of the small "x". The capital "S" is still bigger because that's part of the way it's supposed to look. Here is the result:
It's not strictly the same, but close enough for my needs, and the font is free (GPL actually) :-)