They dont amalgamate fibre like that.. They are likely to be on separate fibre spines.
My only confusion is on the provider selection when it comes to the Winster & Darely Dale home exchanges.
Our home property is on an FTTC connection to that exchange (which i now understand to have it's head end in Matlock, not Darley Dale which provides our copper phone service), with TalkTalk as the provider.
The Winster property cannot get TalkTalk services as it says 'Out Of Our Network' when i enquire about the address, but this is confusing if the OLT for the Winster FTTC is in the same headend as my home property?