Hi bizz in answer to your questions I am not fully clued up on all the issues raised, but from what I have read via the forum.
1) have you tried resetting the system?
2) aerial adaptors (fakra) are available on eBay for around £7
3) If your Ed30 is a 07/57 onwards then the canbus should be ok.
4) the latest versions of the rns (excluding dab) would have an led screen and a star button next to the eject button.
Hope that helps, although there are many others on the forum who are more knowledgable than me who can clarify any points raised.