Hi Steve to the forum. Clutch failure at that mileage is a little unusual but there as been the odd case iirc. On average i think 40k can be expected from the clutch. Hard to know what to say except those prices been quoted are massively over the top for flywheel/clutch replacement.
Seen a quote on here before from a Nissan dealer which was just over a grand and if you got your clutch/flywheel replaced at ESR you got expect to pay a lot less
Not really heard of anyone else having clutch/flywheel problems on a low mileage late model car.