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A few common causes of rough idle on Astras have been brought up either on here or on facebook. The ones that seem to be most common are like Tucpal said the fuel pressure sensor, suction control valve, MAP sensor, faltering glow plugs, dirty fuel injectors. You could also check your air filter, see if its blocked or needs replacing, and maybe give the MAF sensor a clean while you are at it.
I would recommend putting some form of diesel treatment like Wynns Diesel System Cleaner or Magic Bullet Diesel Catalytic Converter Cleaner in your tank when you next fill up, this can help clean injectors etc. There are a number of things you could do yourself if you read through some of the how to's on this site, inc how to service your car and egr, map, maf and throttle body clean.
BTW, the Astra doesn't have an additive tank, so if the diesel treatment you purchased is for cars without the additive tank then it will be okay to use.
I would recommend putting some form of diesel treatment like Wynns Diesel System Cleaner or Magic Bullet Diesel Catalytic Converter Cleaner in your tank when you next fill up, this can help clean injectors etc. There are a number of things you could do yourself if you read through some of the how to's on this site, inc how to service your car and egr, map, maf and throttle body clean.
BTW, the Astra doesn't have an additive tank, so if the diesel treatment you purchased is for cars without the additive tank then it will be okay to use.