Like with Openreach FTTP it depends on your chosen ISP, CityFibre are the wholesale supplier.
CityFibre support DHCP or PPPoE, I've seen both used on different ISPs.
You also need to know the VLAN - VLAN0 (802.1Q header used for setting the 802.1P priority bits only) and VLAN911 seem to be the most common. I think VLAN101 may have appeared as well with one ISP. The VLAN0 approach can be problematic as a lot of consumer kit does not support that.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/at... is quite useful to explain VLAN0 stuff.