[Stuart]

It didn’t take long for people to realise that there was no delay on the feed and it was in fact live. You then began to get people in the background pretending to fight or fall down the stairs. Some of the videos are on YouTube. 

That’s then when they blurred the back ground and added red blocks to look like coloured glass railing.

That's hilarious. 

I think when the BBC first had the back-projection screens in N6 around 1999 which showed the newsroom, they deliberately had a delay on the feed in case anyone fell off a balcony or there was some other incident.

When they altered the image to add some red walls in the newsroom background it all just became a recorded loop.