I recently had 0303, which is 3rd cylinder misfire. Fortunately I was still under 3 year warranty so it got fixed free of charge, and yes it was coil pack failure, although I have read that it can be caused by faulty EGR valve.
If your car is still under warranty get it to vauxhall to repair, beware though that I had to put my old GM spark plugs back in otherwise they wouldn't have repaired it.
Hope this helps a bit.
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