I can now report that my problem has been fixed (after my dash was taken apart twice
First time they replaced the antenna but I still got 0 satellites and 0dB readings in the engineering menu.
Second time they repositioned the (same replaced) antenna from directly above the radio to behind my speedo - bang 8 satellites.
I suspect something (my radio?) is the source of some serious EMI in the centre of my console.
Back to loving my car ....