S40 V40 Cars: Perplexing noise with wheel movement VIDEO

[captainbrown]

Hi All, hope I'm doing this right, I'm new to forums in general.

I have had an immaculate 1999 Volvo V40 2.0 Petrol for nearly a year now. I drive about ten miles to work and back every day, about half of which is in heavy traffic.

There is a noise coming from the front end of the car, I think more on the driver's side but can be heard from the passenger side too. It sounds a bit like an old washing machine motor (SEE VIDEO LINK - listen carefully.)

The fluctuation in volume matches the wheel speed but between 20-50mph the pitch is the same, slows down when the speed drops under 20mph and stops at 10-15mph.

When driving away the sound starts only once I reach about 35mph, and doesn't go away at all until I slow right down. Often it comes back when I speed up again, but at a different volume.

It is unaffected by acceleration, braking (including emergency stops in the wet with ABS), steering, clutching, changing gears, weight in the car, tyre pressure or engine speed. The tyres are wearing evenly. The ABS rings look fine and there have never been any warning lights of any kind.

I have tried everything I can think of but I have absolutely no idea what this is and I'm at my wit's end. My father was a mechanic and has no idea, I have never heard a car make this sound before except when the alternator is failing, and then obviously it changes with engine speed not wheel speed.

HELP!

https://photos.app.goo.gl/uu6aBbwFtkD1YA3C9