Annoying Door Rattle

[wagonboy]

Hi all, had my Ed30 for over 3 years now, car has been fatastic but it has developed a little rattle which appears to be coming from top of the drivers door ( handle end ) its just very annoying. I know this has cropped up on here before but has anyone fathomed out what the cause of this is and how to remedy it. Thanks for any help. Chris