Cool, thanks for the responses guys.. will snap some pics of the dash - but basically it's a slot load cd (6 disc changer) in the dash - all seems to be integrated, but I think it's a single din.
Does that mean I can simply connect a 3.5 cable from my iPhone to the antenna signal and get a good qlty connection? Cause I've never found a decent quality fm transmitter for the iPhone. Would certainly make for a decent cheap solution!
Cheers,
Adam