I had the same problem the other day, with mine not starting (although its a Zetec-S)..done it twice now..not sure if its the weather or prehaps its time mine went to the garage too after reading the comments above

that same thing happened with mine i took it back to ford and they said they couldnt find anyting wrong with it, it seems to be ok now tho i reckon they did something but didnt tell me , bloody HENDYS