Squeaking, whirring and grinding

[mw2299]

I've had my J since mid-August. Haven't really had any issues until now. It's a 1.3 CDTI. I noticed a squeaking that was getting louder. I looked under the bonnet and it was one of the belts (not sure which) but it didn't quieten/get louder with acceleration. The squeaking has now died down and now I mainly hear a whirring from inside the car, as if the belt is struggling to go round. Just earlier on a short journey I heard three times, what I can only describe as a grinding sound, the same sound you get when you don't quite get the car into gear. It's random (possibly when I turn though) and doesn't happen when I change gear.

I'm a bit stuck, I need to take it to my mechanic but he's away for a week so I'm not sure what to do.

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