@Limey729 

>my mesh system is connected to a Sky router.

You can also do this:

1. Check with your ISP tech support (or their support forums) if parental controls on Sky broadband router allow blocking VPN in general or Opera VPN specifically, and make necessary change on Sky router;

2. If not, check if Sky broadband router allows to block access to specific Web sites, then google "how to block Opera VPN" to find list of web sites that must be blocked to stop VPN access in Opera, and add all these web sites to Sky router blocked web sites list.

@TP-Link traffic is not being reported when he goes through vpn. Therefore I cannot block