Many country based video services check your location using your IP address.
To view these UK videos in the USA you would need to use a proxy server that gives you a UK based IP Address.
Search with Google on how to use a proxy server.
It is not a trivial thing to set up, but many people use a proxy server to hide their real location.
You can do this for free although some sites seem to want you to pay for access to a proxy server.
There are many free proxy servers.