In the 1975 referendum debate she took a Eurosceptic stance. During a debate with Liberal leader Jeremy Thorpe he asked her whether, if the vote would be yes, she would stay on as a minister. To this she replied: "If the vote is yes my country will need me to save it." Despite her views she later became a Member of the European Parliament (1979–1989). Her public support of leaving the EEC infuriated Wilson. Castle recorded in her diary and in her subsequent autobiography that Wilson summoned her to Downing Street where he angrily accused her of disloyalty and that as he had brought her back into the cabinet against other's wishes and advice, he deserved better from her. Castle claimed she offered to resign, but Wilson calmed down and she continued to campaign for leaving in the referendum.