Thank goodness! Someone finally suggested a triple WAN router (well actually Quad WAN but who's counting 😁)!
The Wifi bit is well-covered in this thread, but if the OP wants failover to ensure a reliable Internet connection then a triple WAN router - a built in VDSL modem for his FTTC connection and two ethernet WAN ports for the FTTP and Virgin Connections, with the virgin modem in bridge mode would do nicely. Or three Ethernet Wan ports and a separate VDSL modem, as suggested above.
Just for full disclosure, at home I use a Draytek dual WAN router (Vigor 2862) with FTTP and a backup FTTC connection for similar purposes. I use a TP link Omada mesh system (3x EAP245(EU) v3.0) for WiFi with a CAT5e wired backbone. It is not the cheapest arrangement but is extremely reliable. And sounds like it might meet the OP's needs.
NB, My Draytek device will be a bit underpowered for the OPs FTTP speeds. It can just about handle 400MBps but only with traffic analysis switched off.
And goodness me, those Omadas don't half pump some Wi-Fi signal out. I think their antenna arrangements must be very good indeed.
Edited by albany11 (Wed 22-Feb-23 17:20:29)