or you could change the ipod dock in the armrest for the MDI version (one of which i happen to be selling for £40
), which is compatible and will charge ipods etc,
"The Media Device Interface (MDI) offers support for USB devices (memory sticks and hard drives), iPod integration and Aux In along with displaying ID3 tags over the CAN bus to the MFD and the RCD310, RCD510 and RNS510 headunit. You can navigate folders or menus simply via the sound system, with the track playing shown on your radio or radio-navigation display"