I have been through exactly the same - albeit with FTTC and just two houses.
Openreach will remove and make safe, and then have to plan for a new pole installation. It may not be possible to locate exactly. That will normally mean a set of temporary lights and local authority permission which in our case, due to teh LA being slow, at least 13 weeks.
BT (my ISP) provided my with a 4g router as an interim solution - so you will need to be on top of your ISP, but don't expect resolution "tomorrow or next week".
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