[alistairgd]

Yeh I had no warning light, and no error codes logged on the key either. They told me "uhm, it won't log the fault until the next time the car is started", okaaaay.

The thing about that is, they tell you there is no damage caused by unburnt fuel in the affected chamber, and no stress to the components, because the car knows there is a fault and cuts the fuel supply to the cylinder. Kind of hard to swallow that if the car is not logging a fault at all.

If the warranty has expired you'll be on your own. I believe the parts are not too expensive though, so if there is a good independent near you, get it done there.