I have an humming noise when on the Motorway, it is probably at one second intervals it sounds as if coming from the front of the car. 13 Continental GT Speed done 36k.

 

Has the car been sitting for a couple days? If so then that is the same thing I faced on my 2014 W12 Flying Spur. Nothing to worry about.

 

Is it possible to record the sound?

 

I've had that as well. Got an alignment done, wheels checked, bearings checked.
Nobody could ever figure out what was causing it. Mine was a 07 W12.
These cars are quite sensitive to alignment so I would suggest trying that first.

 

I had a hum from the rear axel which turned out to be the offside rear wheel bearing. Sounds like you've had that checked. Might be worth having someone check the tyres for uneven wear when the air suspension loses some of its dampening? Some people complain about the Perelli P Zeros and recommend changing brands.

 

The wheels and bearings have been checked and its still there. I personally think it's coming from behind the dashboard in the centre. I have tried to record it but difficult to pick up on a recording. I bought it from an independent Bentley dealer and have three months left on the warranty, so considering having another specialist to look at it.