Route UK On Demand TV addresses through WAN instead of OpenVPN PIA

[A Former User]

I would like to route UK On Demand TV addresses through WAN gateway instead of OpenVPN PIA gateway as they will not work when going through PIA. I am a UK resident so those services will work when using my WAN IP address.

I have managed to get BBC IPlayer working by creating a IP alias using Type: Network(s) and using 212.58.224.0/19 and then passing that rule on LAN interface.

What IP address blocks do I required to get the following services working:

www.itv.com (The ITV Hub)
www.channel4.com (Catch Up - All 4)
www.my5.tv (My 5)

I have tried adding each of the above by resolving each domain IP address but it seems like each service use other IPs for on-demand content so they complain or will not work ? How can I find out what IP blocks they might use so I can pass them through my WAN gateway?