Noisy Rear End (on the car).

I have a noise from the rear of my '97 MGF. It's a sort of whirring/buzzing sound. The volume and pitch are proportionate to the speed of the car and it is audible both in gear and while coasting in neutral.

I was wondering if anyone has had a similar problem, or if there were any ideas out there that may help me. I thought it may simply be tyre noise at first, but have now discounted that idea. Next thought might be transmission oil.

I'd be very grateful for any suggestions.

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