XK8 - rattle on start-up

[ajmac]

Has anyone experienced a rattle on cold start with the AJ V8? It isn't the secondary tensioners as I changed them only 2,000 miles ago and it sounds different this time around. The noise is only apparent on a cold start and is similar to a hand full of nuts going around in a washing machine drum. As it is only there when cold I suspect it has something to do with the primary timing chain tensioner, as perhaps it bleeds down over night and thus the chain rattles.

Alastair