I've just got a very similar problem. Car has been fine in the 6-8 weeks of ownership but today, on starting her up, the engine was missing and sounded really rough. The engine light has come on too.
The dealer says that it might be the 'limp home' mode, as I've travelled over a couple of speed bumps at the local school He's asked if I'm happy driving it until they can have a look, which is fine if it is purely the limp home mode - but what if it isn't? I don't want to bugger the engine up driving it if there is a more significant problem.
Not sure what to do now but think that I'll ask Life's to collect it and investigate. How do you avoid this kicking in again?