Because for the most part these are actually broadcast, that is to say the archive that the BBC makes available have been sent out over TV or radio waves within

Because for the most part these are actually broadcast, that is to say the archive that the BBC makes available have been sent out over TV or radio waves within the past few weeks. It's not a matter of someone actively seeking out content on a webpage. Its a matter of, say, leaving the radio on in the background when you are cooking, and hearing content with outdated language and ideas.