[volvoid]

It’s very reasonable of them to suggest independent inspection.
One cant expect the garage to hold their hands up and say its their fault, very expensive, but their insurance should cover it. Did they supply all parts used ? If not theres another can of worms, not our fault guv, must have been that dodgy xyz.
Thermostats tend not to fail often and then generally do so fullly open, but not always.
I wonder what cracked the head ? Overheating ? Some failure in doing up bolts correctly ? Is the engine still intact or has it been dismantled ?