@marklyn 

If I am correct, there are some applications and streaming services that have taken additional precautions to region lock specific channels. Some of these additional precautions consists of actually getting the location from the browser, rather than trying to use the IP address. There are some VPN providers that allow you to select an option that would prevent this data from being sent to streaming services. Unfortunately, I do not know if there is a way to easily prevent this data from being sent. 

Out of curiosity is it that you can watch specific channels, but you cannot watch region locked channels?

If this is the case, you might be needing to look at using your login on the applications for each channel. Meaning if you wanted to watch a game that is on BallySports, you will most likely need to log in with your spectrum provided login in the Bally Sports App.