It has a duff thermostat, which I already knew about. That's the only proper fault and that will get fixed.
He thinks he also picked up some rattle from the inlet cam variator (bad) even though it's supposed to have had a new one + cambelt. Problem with that one is that it requires special tools to set up and fit and I have a suspicion that it's been DIYed as I've only got invoices for the parts but not for the fitting. Hence, probably, the rattle. I've asked him to see if he can check if it really had a new belt without dismantling half the engine...
Clutch doesn't slip but biting point is very high, almost above the pedal's rest position. Gearbox is also leaking a little oil, rear brakes don't seem to be too clever either. They work but you can hear rhythmic disk/pad contact when driving around slowly.
Nothing of this is unfixable but as I can't decide if I really like it I have trouble throwing another few hundred at it that I could throw at the Elise instead (to improve the Elise, not to fix it).