I'm in the UK. "This video contains content from Channel 4, who has blocked it in your country on copyright grounds."
So probably not pirated!
Everything the BBC does and has it its archive should be freely available to brits who've paid their tax directly to the BBC in the form of a licensing fee. The fact they withhold anything from the people who paid, in full, whether they wanted to or not for it is morally repugnant.