On Saturday, 18 April 2015 06:32:37 UTC+1, Recliner wrote:
http://www.telegraph.co.uk/news/ukne...nto-a-car.html

Many years ago my father-in-law experienced a similar problem with his Mercedes 190 estate which roared away and could only be stopped by switching off the ignition. It did this more than once and it was apparently caused by a carburetter malfunction. I suspect the BorisBus doesn't have carburetters but the Mercedes in which Princess Diana was killed probably did.