I would have expected the clutch to have been changed before 150k miles, but it's still possibly the original. The big difference between the petrol and diesel models is that the diesel versions wear out the dmf often before the clutch. On the petrol versions the dmf normaslly lasts the lifetime of the car. That's not 100% guaranteed of course but it's rare to need a dmf in a petrol. I've never changed one but have done scores of diesel dmfs.
O.K. Thanks for the info.