This makes no sense. If the belt flew out under the car (I'm assuming you mean cambelt as you have said aux belt is still in place), then how do you know it sounds like a diesel and its low on power?! It wont run without a cambelt!Post just disappeared!
High rpm, doing around 70mph.
Belt flew out under car, aux belt still attached (but almost broke too).
Massive engine noise, sounds like a diesel, low power.
Cambelt and dephaser 'apparently' changed 14k miles ago. No fitting receipt, only receipt for parts (lesson firmly learnt)
Just an update. Car is back now, spot on Dan and The Fatty. Cambelt slipped and has damaged internals for one or maybe two cylinders. The suspect item that I saw in my rear view may have caused the damage as there doesn't seem to be anything missing from the engine bay. Guess I'll never know!
Battery went flat weirdly which is why it wouldn't start.
Based south Wales. Ammanford. Million miles from anywhere - will be on the phone tomorrow getting quotes. How much would I be looking at? Or is it hard to tell without taking it apart?