So after 380,000km, one of the many original factory-fitted components has finally died. The mushiness and butt-load of freeplay in the clutch pedal turned out to be a master cylinder missing most of its seals (yet still not leaking) and filled with more sludge than Hexham Swamp. $300 later, and the difference is night-and-day, with a clutch that disengages within the first 50mm of travel rather than the last 10mm - so much so that it has taken quite a bit of getting used to, with the clutch picking up so high that it feels like you're still in neutral when pulling away. Still, the clutch isn't slipping under power (what little power there is) and passes the old 4th-gear+handbrake test, so I should be able to coax it to 400,000km before it actually needs attention...