Well, I figured it out in the end. Sena Europe arranged for FedEx to send me a FedEx label, I called FedEx who then arranged a next day pick up. As soon as FedEx had picked the package up, I got another email from FedEx saying a package was on it's way to me, and it arrived the next day. Basically I got my whole kit back, less the Sena units and helmet clamps, with new units and helmet clamps in separate boxes.
I downloaded the latest Sena device manager and did the firmware upgrade to 1.2.
I then downloaded the latest smartphone app and configured the units. Helpfully, the vibration sensor (tap to activate) now has a disable feature, which I duly disabled. This was what kept activating the device during high speed riding. I set the radio to Europe and set the frequencies, added my speed dial numbers, and then paired my IPhone 5s as a mobile phone, and the Zumo 590 as a GPS. I don't remember having pair as GPS before (just pair as second mobile) but it may have been there. I then paired the two Sena devices together using the NFC (shaking) method.
I installed the clamp in the helmet, Shoei Neotec, using the wired boom mic. Previously I had used the boom mic, but using the wired boom mic does a better job.
I've road tested music from the iPhone, very clear and loud enough to be heard through earplugs using the speakers if the volume on the iPhone is turned up full, and the music quality using my ultimate ear ear buds is now outstanding. GPS interrupts music, phone interrupts music, phone call quality is good enough that the other caller would have no idea you are on a bike.
The blight of the last devices were that GPS interrupted intercom. I haven't tested that yet, but so far very pleased and worth the faffing.
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