I had a similar problem on the Aero +8, a horrible grinding vibrating noise when turning the wheel with the car stationery or just manoeuvring. I was told, yes you guessed it, they all do that Sir!
I was at the Factory with loads of people in the car park, I started the car and reversed out of my space making one helluva noise which drew much attention.
Steve Morris and Mark Evans were there too, the car was booked into the workshop immediately and problem solved, replacement pump IIRC. Quiet as a mouse ever since so perceviere with it.
