Georgina Gray's history is closely bound up in Calvary Gaol, standing bleak and forbidding on the Cumbrian hillside It's there that her great-grandfather worked as a prison doctor in the 1930s where his involvement in a bizarre experiment would change the course of his life forever TV presenter Chad Ingram plans to conduct a new experiment in the old execution chamber of the now-disused gaol, which will have horrifying consequences