Massive noise behind dashboard

Hi

A massive noise has developed in the dashboard on my K11 micra.

The heater works OK, so it;s not the blow motor.

However when you go above 40mph suddenly you get this loud noise. It gets louder the faster you go, then stops below 40mph.

My Dad reckons it could be the speedo cable. Is this a common problem on the K11?#

Has anyone else had this issue. Can't really drive it on motorways at moment as so loud.
 
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