Thanks guys.
Managed to find someone to code the RN510 and bluetooth module to the MK6 highline white highline display using VCDS today. Bluetooth (phone/phonebook etc) came up immediately but for some reason navigation didn't. We checked all the settings (BAP etc), switched unit/ignition off etc and it still wasn't displaying. Came home and left the car for about half an hour and went back to go out again and it had started working, not sure why.
The only thing not working now is the SDS (voice control). If I press the star button on the RNS 510 (ver p) or button on the steering wheel, I hear the beep but it keeps saying "Pardon". After talking slowly/louder/shouting/swearing it still doesn't work. It's like it doesn't hear the command I say. I think the mic is working as if I make a call, the mic works perfectly. Any idea of what's wrong or what I need to do?