So the address ( according to the checker ) doesn’t have FTTP available, so no ISP will be able to raise an order , the link posted previously can be used to ask Openreach to check if there is an addressing error, it’s advisable to check that the address used on the DSL checker is the same as the Royal Mail entry.
When an area is surveyed for FTTP , ( assuming for now this address is included in the same PON as the near neighbours that can order FTTP ) just because it is potentially ‘difficult’ address to serve, doesn’t necessarily exclude it , provision /capacity is still made to include it , but any order for FTTP can come with ECC ( excess construction costs ) , if the time and expense to provide service is deemed excessive.
It does seem a fairly typical situation, a farmhouse down a relatively long private driveway, a ‘BT’ pole at the entrance, and ( probably) at some point in the past , an armoured copper cable ran from the pole at the entrance, alongside the driveway to the farmhouse, the farmer probably excavating the trench themselves, and BT/OR providing the cable to put into it , the farmer doing the reinstatement.
If FTTP is available, a CBT is provided at the pole at the entrance, the survey note indicates a KCI2 and no duct or overhead option , KCI2 is a 2 stage install , on the initial service delivery visit ( 1st stage ) ECC ‘s if applicable , are discussed , and any mitigation the customer could provide ( like digging a trench themselves is taken into account when providing the costings ( or alternatively, the customer asked to accept a new feeder pole or poles so overhead could be used ) again depending on what’s required ECC may still be appropriate.
In your case because the address doesn’t show availability, it’s all moot , until the address is confirmed as outside the current PON , or it is included , but a data error is stopping the order process, hence the need to ask OR to check.
