As BT have a telephone USO , and the address already has FTTP fitted, then it’s not going to be debatable if BT can not choose not to supply telephony , the only issue is how the ‘landline’ telephony will be supplied in an all IP world, using the existing FTTP network is now the default network , it doesn’t affect the availability of FTTP for others as capacity is provided for all addresses.
As the OP states the idea is to divert incoming calls to the landline number ,to one of a couple of mobile numbers , bearing in mind as a new landline customer, the new landline number will have no history or association with the OP yet , wanting a landline seems even stranger , if the OP already had a landline number that was widely known, or had various ‘adverts’ quoting a landline number , or have a client list and those clients use a particular already known landline number , that’s one thing , but obviously even the OP won’t know yet , what landline number that will eventually be allocated to the landline ,
It seems strange, who is going to call this yet to be allocated landline number , why wouldn’t who ever is going to call the landline simply be asked to call the mobile number instead ?
