I took Jessica's former car to the shops, just to give it a run.
Shocking instantaneous consumption; even on the downhill coast it was saying 14-odd litres per hundred.
Upon returning, I could feel the heat pumping off its offside front wheel area. The sootiness is a good indicator, too.
Pondering the remedy got me thinking. Where the heck do I find an interchange list of caliper kits? As in, there would be unlikely anything so special in this caliper (Bendix, 57mm) that it isn't identical or near enough to (say) a caliper kit fitting a Krautmobile or Swede of some sort.