I can see that you have been speaking with Martin via PM, and he advised that your landline would now need to be connected through your Hub to function.
Do you have the small white adapter to be able to do this?
I wondered if that was what he meant! No, I don't have an adaptor - can you send me one?
The hub is in a completely different place to the phone socket in my house, but I guess I can still use a phone extension cable or something like that to run the phone cable to the router?
I connected the phone to the hub using the adaptor you sent, but there is still no service in either direction. The hub status page says 'telephony (disabled)' so maybe there is something you need to activate at your end?
Either way, can you advise next steps? Maybe we need to rebook that engineer visit?