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Release and self-imposed exile: 1984–1987

From Geneva, Bhutto proceeded to the United Kingdom, undergoing surgery on her mastoid before renting a flat in London's Barbican Estate. There, she socialised with friends, going shopping, hosting dinner parties, and visiting the cinema. One friend said that after her time in prison she remained in "a mildly traumatized state, jumping at sudden noise and worrying about who might be spying on her". In March, Bhutto visited New York City and Washington D.C., where she met with media figures and middle-ranking government officials but was kept at bay by the administration of President Ronald Reagan. Over the coming few years, Bhutto made several additional visits to the United States, spoke to the European Parliament in Strasbourg, visited the Soviet Union, and undertook the Umrah pilgrimage to Mecca.

While in exile, Benazir became a rallying point for the PPP. Her flat became the unofficial headquarters of its members in exile; these volunteers devoted themselves to raising international awareness of the political prisoners being held by Zia's regime. Although she was the party's acting chairperson, many of its elder members were unhappy with this situation, believing her insufficiently committed to socialism and fearing that the party would become nothing more than a Bhutto family fiefdom. Murtaza believed that it was he, and not Benazir, who was their father's designated political heir; as evidence, he cited that he had been asked to manage his father's Larkana constituency in the 1977 general election. Bhutto biographer Shyam Bhatia thought that this was probably Zulfikar's intention, as the latter would have recognised the significant impediments to a woman being elected leader in a conservative Islamic society like Pakistan. Benazir nevertheless maintained that her father had always wanted her to become a politician.

In July 1985, Shahnawaz died under unexplained circumstances in the French city of Cannes. Bhutto varyingly claimed that Shahnawaz had been murdered by his wife, Raehana, or had been killed on the orders of Zia. Zia's government allowed her to bring her brother's body to Pakistan in August, where it could be interred in the family cemetery at Larkana. Shortly after the burial, she was arrested and detained under house arrest in Karachi until November, at which point she was released and returned to Europe. In December 1985, martial law was lifted in Pakistan and Bhutto decided to return home. She arrived at Lahore Airport in April 1986, where she was greeted by a large crowd. An estimated two million people came to see her speak at Iqbal Park, where she rallied against Zia's regime. She then visited Sindh, Punjab, and Balochistan, speaking to further crowds, and re-established links with the MRD, taking part in a pro-democracy rally on Independence Day on 14 August. Following the rally, she was again arrested and detained for several weeks in Landhi Jail.

Back in Pakistan, she agreed to an arranged marriage; her mother selected Asif Ali Zardari as a suitable husband. He was from a landowning family, and his father had obtained additional wealth through the construction and cinema industries. The marriage ceremony took place in the Clifton Palace Gardens at Karachi in December 1987. The event was billed as the "People's Wedding", serving as a de facto political rally, with a subsequent party in a Lyari stadium being attended by 200,000 people. There, some fired Kalashnikovs into the air in celebration, accidentally resulting in one death and multiple injuries. Bhutto would have been aware that being married gave her an image of respectability which would improve her chances of being elected. She kept the Bhutto family name rather than taking that of her new husband. After the wedding, she soon became pregnant and gave birth to her first son, Bilawal.