A5 whine noise

[Johnboy1982]

My 2011 A5 2.7tdi multitronic has had a whine for around 6 months, possibly gearbox but looking for advice please; the noise seems to be road speed dependent and not engine speed.

 

I've uploaded a video showing the noise 

 

This is at ow speed and I even put the car into N and rev to show it isn't engine speed; I can upload a video at higher speed if needed.

 

[Magnet]

Happy New Year to you John. 
Kind regards,

Gareth.

[Steve Q]

Diff issue? I'd recommend getting it checked at a garage. 

[Johnboy1982]

I've already sent a message to a auto transmissions guy in Barnsley, just waiting for a response.

[Steve Q]

Keep us posted on how you get on