I had the box removed and sent to a specialist in London. They stripped it completely but absolutely no visible wear or defect at all! So obviously a quality bit of engineering both mechanically and lubrication wise in regard to OEM fluids.
They suggested to look at the prop shaft centre bearing before the diff which I will do over the winter, I like to keep the car on the road during the sunny days.
If you think about it the wee woooo sound would correlate with the shaft wobbling within the bearing!!
Keep us informed..
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