Thanks for the reply, Matt.
I have not (yet) deleted and reinstalled. I am sitting right next to the hub right now, so let's see what works and what doesn't. When I tap on 'Broadband', I see the network with the hub and the single pod, but both show a 'warning' sign and when tapped, the message "Something went wrong" appears, but trying again produces the desired result. Inspecting the network works fine, all devices are shown.
Performing a scan in my office (where the hub is located, less than 1m from me also seems to get stuck on optimizing WiFi. Two minutes later, I quit the app. I download the update, restart the app and restart the scan, and that seems to have worked: I get a (obviously very good) result.
Went back up to the room in question, and first did a scan in the doorway (if I go too far into the room I lose the WiFi signal altogether). In the doorway, I got 15Mbps down, 8Mbps up. Strangely, this time I didn't even get the 'Optimizing WiFi' screen, it gave me the results at once. I then went halfway into the room, where the signal strength went down to one bar (well it's a dot really), and that gave 8Mbps down, 3Mbps up. The hub is performing well - 1141Mbps down, 53Mbps up.
So it is clear that in this room I don't have a sufficient quality WiFi signal. But now, I cannot seem to find the option to order a WiFi pod from within the connect app...
Also is it giving you any errors when you are trying to log in, for example is it greyed out?
I do not have to log in to the app...