The lady with the "Big Brother is Watching You Masturbate" sign is the renowned spanking model and scene icon Pandora Blake. More pictures, together with a first-hand account of the day, on her highly recommendable blog.
Taking centre stage here, erotic fashion photographer Ben Westwood, who last time led a group of chained fetish models around Westminster. One of the "slaves", Jade (more conventionally dressed this time) is busy texting.
Here's Clair herself looking at home in front of a TV camera. She later turned up on the BBC Ten O'Clock news.
Another proud day in the life of the Home of Democracy.