On 25 June 1967, Boyd was among the crowd of friends who participated in the Beatles' "Our World" broadcast of "All You Need Is Love". Boyd shared her husband's interest in Eastern mysticism. Having become a member of the Spiritual Regeneration Movement in February 1967, she was keen to meet the movement's leader, Maharishi Mahesh Yogi, and so suggested that she and Harrison attend his lecture on Transcendental Meditation at the London Hilton on 24 August. Impressed with the Maharishi, Harrison and Boyd, together with the other Beatles and their partners, travelled to a seminar he hosted in Bangor, Wales, the following day. Boyd and her sister Jenny then accompanied Harrison on the Beatles' visit to the Maharishi's ashram in Rishikesh, India, in February 1968. That same year, she told Beatles biographer Hunter Davies that the four Beatles had a bond that neither she nor any other wife could penetrate; she also said she wished that the band would use their fame and influence to publicly further a cause, as Marlon Brando had done on behalf of homeless children. Boyd provided inspiration for several of Harrison's Beatles compositions, including "I Need You", "If I Needed Someone", "Love You To", "Something" and "For You Blue". In March 1969, as part of the British authorities' intolerant attitude towards the Beatles in the late 1960s, Boyd and Harrison were arrested at Kinfauns for possession of cannabis.