Been teaching myself some basic bicycle mechanics the practical way this afternoon, using my old (and no longer ridden) MTB as a teaching aid.
Rear brake didn't work, so removed the caliper, took it apart, cleaned it, found that the plastic washer at the pivot point had disintegrated, replaced said washer, reassembled caliper (no, I didn't have any pieces left LOL), refitted to frame, re-tensioned cable and voila, one working rear brake.
Loads of tinkering-type stuff still to be done if I want to move her on, so need to decide what to do next.
I have good socket set, range of spanners, allen keys and my topeak multi-tool. Anything else worth adding to that in terms of useful tools?