Had a quick go.
Downloaded the RSAP installation app, clicked Busybox and this downloaded ok. You then have to open Busybox to complete the installation and allow it to root, etc. You then have to go back and install the system files and in doing so permission must be granted for the installer to access root.
I then downloaded the trial RSAP app, again this automatically requested root access and installed. The end result - I've connected to the VW Premium car kit and made the first call. I've not got any numbers in the phone yet, so not tried the phonebook upload, nor have I given it an extended test. I'll download the full app and report back in the next day or so with pictures, etc.
A couple of quick questions, can I now uninstall Busybox and the RSAP installation app? If so, I will need to read up on how to do this as I have only had an android phone a couple of days!
Anyway, so far so good.
Thanks for all your help (and doing things quickly as well),