And the answer - yep, one of the driveshafts has gone
BUT, and a big but, not covered under the warranty I have [not from FIAT, but via AON or somewhere] due to the car being lowered - the inspector will see that, and not validate the claim

so have to pay for it myself

- the warranty is still useful for other stuff that MAY happen though
However, they are also replacing the front disks and pads as well - not using oem stuff - they are using some drilled/grooved disks, and greenstuff pads!!! Worked out as cheap as buying the oem stuff.
Ah well, I just want the car back now....