I managed to avoid drilling a hole, really didn't fancy doing that.
With a bit of care you can just open the gap in the centre storage compartment (inside cabin) enough to pass the iPod connection through. I first fed some 3m number plate tape through the gap from cabbin into the boot. Used this to securely hold iPod connector end of lead. Then from inside the cabin withdrew the tape to the point when connector reached the gap. Then some firm put gentle constant pressure to just widden the gap enough for the connector to pass then relax, and the wire lead flows freely. So now iPod connected to this which lives permanently in the centre storage cubbyhole.
Hope that makes sense.