Unusual noise when vehicle is coasting

Hi guys,

Hoping someone can help me with a noise I've started hearing today. It's the weekend so can't get it into a mechanic for a few days and need to know if I should stop driving it.

The noise is a whoaa whoaa whoaa sound coming from the front right of the car (under).

The car does not make the noise when I am accelerating or braking. Only when it's coasting.

Any help appreciated.

Thanks
Mark