Channel 4 has been hush-hush about The Experiment (Wednesday, 10pm), revealing only that the documentary will “open the door” to an “experimental new residential home”. What it turns out to be is a provocative reality documentary that draws a direct connection between the Nazis’ murderous dehumanising of disabled people in the 1930s and 1940s and the demonisation of people with disabilities in modern Britain as “benefits scroungers”.So it’s strong stuff, and no punches are pulled by actor Mat Fraser and rights activist Sophie Morgan, both of whom have disabilities and see proposals in the UK to cut benefits paid to...