Thanks. They were fine. It will be connected up. I did think the tail pipe looked a bit sooty though, but no doubt that will show up if it is not running right, and not just caused by slow driving in congested roads round here.

After a sensor was replaced, and the problem seemed solved, a week or two later, it all happened again. Another fault was that the radio/sound system refused to switch off, and these were corrected by replacing the PCM, the car's computer.

No further troubles so hope it's behaving properly now. Glad it was all done under warranty.