"Important notice" page before accessing 192.168.0.1 / Router admin? Legitimate?

Hi there

Attempting to access the router settings page of my Superhub 5X on various devices brings up a "Important notice" splash page to ignore certificate warnings.

I've had services for over a year now, accessed the settings multiple times before but never seen this page until this evening - Googling the copy on the page doesn't seem to return any results, so my suspicions are aroused and I want to check if this was a legitimate page served by Virgin Media / the Superhub (was it added in a recent update?), or if it's a sign of a compromised network/hardware?

Thanks