Well that was a bugger of a job, in the end I got the missus to have a go as she has smaller fingers, and she managed it!
So all rigged up and working! Plays music via Bluetooth from my iPhone and calls/phone book works well too. All on the basic Business head unit.
@Russ59 - that looks really neat. I don't necessarily need the connection as I'm using Bluetooth, but it would be great to have a smart solution for charging the phone.