UK - Suddently getting tons of lag?

My game’s been fine since launch, now this week I’m getting near-unplayable lag in Warzone. Things like BR shots not registering, grenades throwing a second later than the animation etc. I can’t help thinking this is a result of the “improvements” made to matchmaking earlier this week.

Gamertag: Monitor Chakas
Region: UK
ISP: BT
Router: HomeHub 5
Connection Type: Ethernet
Down: 30 Mbps
Up: 10 Mbps