Thanks for the suggestion, Welton, but per my original post this was the first avenue explored. My local garage assures me that all the bolts are tight. I do wonder if it's worth removing the manifold and fitting a new gasket anyway - but this is going to be in 16 months' time as I've just been posted abroad with my work, brought my family with me, and parked up two cars and two motorcycles for our return! They'll each get occasional use, but troubleshooting the T5 startup rattle will now have to wait!
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2003 V70 2.4T SE | Owned from new | M56 | Bilstein B4 | Nivomats | BSR PPC | Ferrita Exhaust | Poly small bush in lower torque mount
2008 C30 T5 SE Sport R-Design | Dynaudio | BLIS | Winter Pack | Towbar | Parking Control | Keyless | 18" Atreus
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