The white bearded man on the left is Guy Kewney, an IT journalist who is the editor of Newswireless.net. The African man beneath is Guy Goma,
After Apple Computers won a court case against Apple Corps (the record label for the Beatles), the BBC wanted to interview Guy Kewney, as he's an expert on issues related to music downloading on the web.
Guy Goma
A BBC studio manager approached him and asked if he was Guy Kewney and he said yes. "Confused but co-operative," they rushed
So the interview went on the air live. You can watch the video here. The shocked look on the Goma's face as they introduce him as the editor of Newswireless.net is absolutely priceless.
Update: As David R points out in the comments section below, the BBC misreported that Goma was a cab driver. He was actually at the studio for a job interview for an open position as a data support cleanser. So not only did the BBC put the wrong guy on the air, but then in their apology, they misreported his occupation!