Engine, Exhaust, Drivetrain, ECU
Mine went in for a service last week and it has the same issue as mention on here. On inspection by the mechanic the coil pack was found corroded, which was causing a misfire, and therefore the juddering. Quite poor since the car had only done just over 25,000 miles at the time. So far it seems to be much better. I thought i'd let others know just encase it can help anyone else.
2015 Corsa SE 1.4 90PS Automatic.