With a massive amount of help from Stu, over at
http://www.octavia-vrs.com/ I've managed to install the OEM bluetooth in my 57 plate GTI. Installation was fairly easy, but does require a lot of trim to be removed, including the dash pod, see here for a guide
http://www.octavia-vrs.com/technical/bluetooth.html Although this is for a skoda, it is very similar on the Golf. Also this is the latest module for compatibilty with the new RNS-510 sat nav, which is my next upgrade once I get the cash.
Anyway with this installed you get full voice activated dialling either just say the number, or name from phone book. It also integrates with the display and automatically downloads your phone book to the car, so you can dial from the MFSW controls as well.
The whole kit costs around £200, plus delivery, which I did not think was too bad when you compare to the cost of the parrot, with CAN bus controls.
Here are some piccies
The Kit

On the display

The mute button now activates the voice dialling, phone button does nothing, and OK will answer or make calls.

My phone, unfortunatly shows Skoda but Ho-hum small price to pay.
