When Nazanin Zaghari-Ratcliffe returned home to London after six years of arbitrary detention in Iran, she brought back with her a small patchwork cushion. Pieced together from scrap material and made with the single sewing machine available in the prison, it was the product of a communal craft circle. It's something very, very precious to me, she said. So precious, in fact, that she has worked on a new collaboration between London's Imperial War Museum (IWM) and the fabric department of Liberty,