As Sikhs all over the world mark 30 years since the notoriously bloody Indian Army attack in June 1984 on the holiest Sikh shrine (Sri Harimandar Sahib, often called the Golden Temple) in Amritsar, leading Sikh organisations have asked David Cameron to repay the debt owed by Britain to the Sikh nation. They want him to press the new Indian Government to respect the right of self-determination and other human rights, or face stern international sanctions.