There is a strange noise from the left side of the car. It starts at about 25mph and does increase with speed.
With the car in and out of gear it is there, but the pitch changes slightly.
It doesn't get much louder at any time.
Describing the sound it sounds like a whir or maybe whine, but it doesn't sound like a typical gearbox whine and it doesn't appear t come from the turbo.
Initial thoughts was a wheel bearing, but it's not that characteristic hum.
Stationary in neutral the sound can't be recreated.
We have decided it's the left side due to it being loudest from there, can be heard slightly with straining with the window cracked, but not on the right.
Anybody able to suggest any likely culprits?
Known faults at this moment in time - swirl bar is off.