>Openreach have been supplying cable with copper and fibre cores for some years now for use in new developments. I think the mandate isn't so much the need for a weird adaptor but to simply require those fibre cores to be connected between street cabinet and premises on largescale developments (ie. any development that requires the installation of new street cabinets).
As you say - only valid for developments where new cabs are being installed. These are not all that common except on the massive developments anyway - my last house was on a development of ~30 houses - no new cab for that, and only DSL (admittedly decent DSL, though). Then I built my own house, completed last year. BT (a) couldn't even organise the engineers to turn up to install the new line even with many months notice and the nearest terminator on a pole being a mere 20m from our front door, and (b) would have been hobbled by the local poles only having copper termination points. At no point did they mention the option of supplying combined fibre/copper, and it was not documented in their "developer guides" that they publish.
Fortunately Gigaclear were deploying in the area and now I have shiny-fibre and no BT infrastructure. Cheaper running costs, and a higher bitrate. The only niggle I might have is that there are more unplanned outages than I've ever had on BT infrastructure (2 significant ones in a year, both reportedly due to non Gigaclear infrastructure falling over - which possibly highlights a lack of investment in redundancy of backbone links)
Biting the hand that feeds IT
