I've heard green label, i checked mine and it was green label.
Also, today i tried unplugging it and running the car without one, but it ran like a piece of shit. basically ran the same as when it plays up, except when its connected it goes away for a while. (edit) just been informed this is due to limp mode.
Ill explain it so i can get a few more opinions;
When i start the car up cold is when it's at its worst, the idle will bounce up and down for a bit, sometimes sit at close to 2000rpm for a while, and i have to wait for the engine to heat up a bit before its driveable. if i try drive it before its warm, the car will stutter, and rev's behave as if they're hitting a limiter. if i idle and rev the car while its playing up, it will also behave as if it's hitting a limiter, at around 2500-3000 revs. recently its been quite hot and ive noticed the car has been able to drive straight away from a cold start, but in a cold climate it will play up.
The car will drive fine for a while once warm, and have the occasional miss and lose power for a bit, but it comes back. might do this a few times before back to normal. It hasnt been too bad recently in the hot weather. Also, when im idle, sometimes the engine will just die.
Thats all i can think of at the moment.