jdoocey

I have recently purchased my Citroen C4, petrol 2007. I usually drive with my windows closed and radio on, however yesterday I had radio off, and windows open. As I was driving along, at random intervals I could hear a rattling. Sounded like I was driving over a grill/drain. Thought there may be something loose on the underside, but goes over speed humps with no issue, and cant see anything hanging down. Any idea's?? Thanks