And I believe I have diagnosed the human error I alluded to! If I restart the wan interface I can see it fairly clearly. After clicking restart in 8 seconds an ERROR is displayed Unknown Error (USER_REQUEST), but with patience, reliably, in 28 seconds, the connection comes up, the error disappears and an IP address appears and RX and TX start moving.
In our haste and fatigue that 20 second gap, which may not seem long but I ask ou to watch a timer for 20 seconds when you’re feeling stressed and under pressure and reconsider, we decided the connection had failed (on account of the Error!) and so proceeded to try the next thing …
In the interim, I had functional internet all afternoon, then rebooted the Omnia and it’s all broken again albeit in a different way. Reported here: