Supplementary question: I am currently using a Draytek Vigor2710Vn ADSL2+ modem/router, with builtin VOIP. WIll that work on fibre, or will I have to use a different, ISP-supplied router?
You don't need to use an ISP router but you are supposed to use the OpenReach supplied supplied VDSL modem.
There is no obvious advantage in replacing the OR modem IMHO. The router used needs to have a WAN connection and needs to be able to handle the speed of the VDSL connection.
The Draytek 2710, like all Draytek products, is a fine ADSL modem / router but unlike others (like the 2820) it does not appear to have a WAN 2 connection to allow connection of a modem.
It is also liable to have difficulty routing data at FTTC speeds. If you need the VOIP and similar facilities of the router you can obtain any router with the facilities and it does not require abuit in ADSL modem (a "cable" router).
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