911DG said:No - no strange noises, a tiny bit white smoke on start up but nothing to speak of. No oil on the ground - I park in on the drive so any oil would be very clearly visible.
It could be that the poor running and oil loss you suffered was independent of any scoring.
There are plenty of cars with marked or lightly scored cylinders that carry on for years with the right oil and driving. Ideally it needs doing one day, but maybe at a better time for you.
I'd be surprised if a car could go so quickly from working fine to running badly due to scoring, without a gradual degradation in performance or other symptoms showing.