Thanks Randy for the reply. I've seen mention of the jumper plug (SES plug?)
You think I need to disconnect the blue connector and fit this plug on the end?

I'll give it at try but could take a while to get one.

Re the disconnected cable, I don't know if this applies as I have a NAV head unit but its worth checking all the plugs I can find are seated OK.

You believe I have voice then but it just isn't working cos cars still under warranty!!!