Having finally got my 20VT fixed, MOT't taxed and insured etc my first run for a while ended up with a noisy clattering sound after around 20 minutes. Sounds like its the engine or the valve gear but not sure. No loss of power or performance but obviously I'm not wanting to drive it any further. Turbo is new, clutch is new, nothing has been done to the engine so very puzzling as I'm told they are bullet proof. Any ideas anyone?