had the exact same issue, as simon says, it was the crank pulley.
Even my mechanic originally thought it was the aircon compessor as it only made a noise when the aircon was on.
They finally found the pulley was the cause by putting a chalk mark on the outer and inner part of the crankshaft pulley and found they were seperating and moved.
The denso aircon units Rover used are very good quality units and rarely go wrong.
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