There are of course now many proxy services available online, but how do you choose one. Here's an example of one of the first such services which has now been around for about 8 years.
This is not only a UK proxy service but it also gives you access to a huge network of servers across the world. This allows you to bypass any restrictions you might come across. For the BBC for instance you'll need a UK proxy, then switch to a US one for sites like HBO and Hulu.