Dashboard rattle.

[Johnny]

I have a very annoying rattle comming from behind the passenger side dashboard. Only happens on the move. Any suggestions ?

[Big Jonah]

Erm, turn the stereo up?

[davesconfused]

I had this one, turned out to be a loose bolt that holds the plastic inner wheelarch in place. Have a look. its located outside directly behind the front wheel.
Hope yours is that easy! I had everything apart trying to find it.