All the major British TV channels have great web sites with a large amount of their programmes available for free. However nothing really comes close to the BBC iPlayer with several channels and the ability to watch thousands of hours of great shows and watch the BBC live. Unfortunately you'll be blocked from all these sites if you access from outside the United Kingdom.
This video shows you how to hide your real IP address and access the BBC online from anywhere in the world. By using a sophisticated network of proxies you can watch whatever you want irrespective of your location.
It's important to be aware that although you can find some free proxies online which also can be used, these do come with some risks. Many contain malware and adware which is installed whilst you route through them, and others are often misconfigured servers which are used without the owners permission.
The BBC iPlayer will work with a simple proxy server as long as it is based in the UK, however to download and watch live you'll need a VPN like Identity Cloaker or similar service.