There was an article/post a while ago , apparently some customers that currently have telephone and broadband , not necessarily a shared metallic path facility where different providers deliver one service each but where the customer had the same provider for both services , but importantly on ADSL with no FTTC or FTTP available , will get a second line installed that delivers a new broadband service from EE , the existing BT ‘line’ then can be changed from ADSL to a PDPL (pre digital phone line ) maintaining the customer’s two services, albeit now on two separate copper pairs , and some sort of billing jiggery-pokery keeps the costs the same as they were .
The article never made it clear why this was necessary, the assumption was that ADSL (exchange based broadband) or SoTAP (ADSL without PSTN telephone) although initially thought to be able to deliver DV , either ultimately proved not to be compatible with DV or the costs involved were not justified for a very small number of customers.
Perhaps the OP visit from Openreach will be to install this second copper pair with EE ADSL(SoTAP) .
