It involves a thin, bendy tube with a camera attached being placed a short way into the rectum and lower bowel. The inside wall of the bowel can then be viewed and polyps removed.
They seem to have missed out the bit about Agent Picolax and the sedation etc.
I was never sedated! Was I supposed to be? Not that it hurt anyway.
It was quite fascinating watching where the sun doesn't shine, on a TV.