How strange. It seems to have sorted itself out!
I paired my old BT330 to compare it, it worked fine, so I removed the Akono and re-paired it and it seems to be working.
Thanks for the comments folks, it's useful even though you didn't get the same probs!
Now the next issue is how to reconcile the fact that SE say this thing provides "Caller ID", which I took to mean the NAME of the person, with the fact that it doesn't do anything of the sort... only the number.
And who really remembers the numbers of their friends these days?!