Ten years ago, while she was a Minister in the Labour Government, Harriet Harman explained why she believed that Britain needed more women in positions of power.1 She argued that having more women in top jobs benefits all women because of their better understanding of women’s lives. Women bring new insights to management and break up what she called ‘male groupthink’. She ended her article on an optimistic note:

It is inconceivable that there should ever again be an all-male Cabinet. Public opinion would find it unconvincing to be told that the country could be governed by men alone. So too the days of the all-male Board are numbered.