had this on my 55 plate combo cdti,hard to start when temperature was around 0c or lower.
was like a heater plug or 2 were gone
vauxhall said it was the starter so changed it,
vauxhall have a modified starter which turns the engine over faster to get it past the reasonance band of the dual mass flywheel they say,although changing starter will cure problem for while,its really hiding the fact that its your dualmass flywheel thats gone which starts affecting clutch pedal,starting,rattling when ticking over etc etc and is gonna cost a few hundred quid to sort cos you have to replace clutch as well.
just a suggestion...thats what mines got and now the warrantys out
raa57
April 2009