I will have my EE Bright Box 2 connected via VDSL, connected to above PFSense box, then to my network
I'm not familiar with that particular VDSL box. Can it be put into bridge mode? Ideally that's what you want. But be aware that if it is in bridge mode (acting as a modem only) you will require an additional wireless access point on your LAN. So pfSense takes over the routing/firewalling and the access point takes over providing wireless LAN access.