Thanks for the replies.
"I'm assuming that it does not make the noise when stationary? So it must be related to the speed of the car to some extent."
That was my starting point - I usually associate a squealing noise with a slipping belt but, with the engine running and the car stationary, the noise doesn't occur. Once the car is moving, it just seems odd to me that the pitch of the noise doesn't appear to alter with increased speed.
My son has borrowed the car today to do the 140 mile trip up to Nottingham so I'll see what he says about it when he gets back.
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