Blokey, just had my car back in the garage and they said its the vcu he replaced , hes had two bad ones in 2 days. Ive now got a new one on and all the vibration is gone runs really well again. Hope this helps you.

Glad ive seen this post as im having exactly the same problem. ive had new tyres fitted and balanced with a new vcu and prop bearings. Im thinking of taking it to a main dealer to get checked out as ive heard they line the prop up with a laser.