About Four Rooms Season 3, Episode 12 :

Four of the country's top dealers in art, antiques and collectibles wait in four different rooms, each prepared to spend their own money if the right item comes through their door. Members of the public show up with their prized possessions for sale hoping to walk away with a life-changing amount of money. They need to decide when to sell and when to see the next dealer, because once they leave the room they offer is gone for ever. Items include one of the first flushing public toilets, a mannequin lamp, a Miro painting and the Queen in stone.