Apple has sent me a different iPad back. Hoorah.
I wonder if if it is a Pro v1 or a Pro v2, that would be a bit too optimistic. Wonder how I could tell?
Nightmare getting it set up initially because of weirdness concerning the change of mac address and the mac-based multiple layers of WLAN restrictions. (Yes, I know, I know that isn't real security, but it prevents Mrs Weaver from giving out the wrong kind of credentials by accident.)
Initially I didn't even think that the MAC address might have changed, there was no warning. So could not connect to WLAN at all. Then When I reconfigured things there was still some kind of weirdness, which never got diagnosed. Fixed it by logging in to a guest SSID which was enough just to get the setup going.