well, i have officially given up, so took it into PMW in Chelmsford today..
they acknowledged the noise, removed the scuttle panel and secured.. noise still there, checked the inner splash guard and tighten all that up... noise still there, re-tightened all bolts on the n/s/f wing and following a road test apparently all was ok..
i've just driven home, nearly £70 lighter, and absolutely nothing has changed
*sigh*