The trails just lead to the standard 2 panel wide joint box on the pavement.
Ah, so that means both sets of tie-cables take a longer route between the PCP and each respective "fibre cabinet".
My assumption as to what has taken place is that the original
Huawei SmartAX MA5616 equipped cabinet was planned based on data provided by the developer of that site. For whatever reason, the cabinet was installed but the power supply was not connected. Electricity supply company's transformer at its maximum, upper load, limit perhaps? Eventually the transformer was upgraded . . . maybe using money supplied by developer?
Subsequent to that, further data may have been provided by the site developer and coupled with expressions of interest from the home owners the potential capacity was doubled.
A slightly abnormal situation and maybe not something due to BT divisions/companies.