As its name indicates, Thoradia VPN Interface creates a VPN interface
Some subsystems, such as qBittorrent, can be configured to bind to this VPN interface instead of the default network interface
The system and other subsystems will continue to bind to the default network interface
I am not aware that iPlayerWWW can bind to a specific network interface
If it can, then configure it to bind to the thoradia-vpn interface
Otherwise use a more appropriate VPN configuration
Thoradia VPN Interface can coexist with VPN Manager for OpenVPN
For example, your system is located in a country, uses VPN Manager for OpenVPN to connect to another country, and uses Thoradia VPN Manager to connect to yet another country