Had the dreaded "stop engine and check coolant level" message in the DIS this morning. Managed to get home after a brief check to ensure there was still some water in the expansion tank, and drove to the dealer at lunchtime. Thankfully they agreed to look at it this afternoon, and have just called to say it needs a new pump, but as this won't be with them until tomorrow they need to keep the car over night. The car has done just shy of 17000 miles. There have been one or two mentions of water pump replacements on here - it looks like this could turn into a common fault.