http://www.superfast-openreach.co.uk/where-and-when/
The above link has the most up to date Fibre broadband exchange and cabinet data available. But do remember, it is the cabinet which is the crucial item.
Since we’ve been installing Super Fast Fibre Broadband we have noticed that it can be just as erratic as ADSL. In some cases the old ADSL broadband has been more reliable for Voip than Super Fast Fibre Broadband. We are constantly being told that Super Fast Fibre Broadband was not designed for business which is why its rarely available on trading estates. It would seem that lease lines and private data circuits are still the way to go.