It's official , the youtube account "theukatheist" has been taken off by youtube, over 9000 subscribers gone.
Censorship is the suppression of speech or other public communication which may be considered objectionable, harmful, sensitive, or inconvenient as determined by a government, media outlet, or other controlling body. … It occurs in a variety of different contexts including speech, books, music, films and other arts, the press, radio, television, and the Internet for a variety of reasons including national security, to control obscenity, child pornography, and hate speech, to protect children, to promote or restrict political or religious views, to prevent slander and libel, and to protect intellectual property. It may or may not be legal. Many countries provide strong protections against censorship by law, but none of these protections are absolute and it is frequently necessary to balance conflicting rights in order to determine what can and cannot be censored.
UPDATE: It was do to copyright infringement due to him posting the 2012 Rumble debate with Bill O'Reilly and John Stewart. The company that produced the event apparently contacted YouTube and demanded it removed, along with other videos of their production showing it in full. It's not clear if the account was terminated due to a YouTube policy or if the company who the copyright belonged to requested it. (Anonymous commenter)