This is the same connection settings as BT Infinity Fibre ( all the ISP’s resell BT’s Service ) as per link here : www.draytek.co.uk/support/kb/kb_vigor_v2850_setup.html

The Main Settings Are :

[WAN] > [General Setup] > [WAN1] and DSL Mode : VDSL and set the WAN VLAN ID should be set to 101

[WAN] > [Internet Access] and set the Connection Type as PPPoE. Enter the username / password details that were provided by your ISP in the appropriate fields as shown: