It's near midnight and a cluster of curious paranormal enthusiasts are gathered in the darkened foyer of the National Film and Sound Archive building in Acton.
We are peering up at a bronze plaque emblazoned with the name of Sir Colin MacKenzie - he is the orthopaedist, comparative anatomist and philanthropist who was the driving force behind the Institute of Anatomy, the very reason this stripped classical sandstone landmark was built in Acton in the early 1930s.
