Thanks Peter!
What a daft way to label it. Your suggestion is much more sensible. I changed the setting, Hotspot was switched off, wifi reset, success claimed and... I still got 10.0.01. Powered off, powered on again. Yes indeed I still ended up with 10.0.01. Despairing, I wondered if proximity to router might help. Plugged in, switched on and I was online immediately.
Moral of story: if in doubt start off with BB1 right next to the router.
All is now good. You're a gentleman, sir.
Merry Christmas.
Wilf