Virgin Media runs its own cable network (separate from Openreach) covering ~16 million UK premises. Download speeds are class-leading for cable, but upload remains the obvious weakness compared with full fibre.
Cable nodes in dense areas saturate after 7 PM. Virgin can move you to a different OLT port, open a complaint citing time-of-day patterns.
DOCSIS upload is asymmetric. Look at Virgin's Volt fibre plans (in select areas) or wait for the XGS-PON migration.
Put the hub in modem mode and add your own Wi-Fi 6 router. This single change typically doubles real-world Wi-Fi throughput on M500 and Gig1.