Booth had five other daughters with partners he did not marry. He left Gale, his first wife, in 1961 for Julia Allan, with whom he had two daughters Jenia and Bronwen. He had a daughter, Lucy Thomas in 1967 with Ann Gannon, who worked in radio sales, after a brief relationship; this did not become known publicly until 2002. His relationship with Pamela Smith, which began in the 1960s, lasted 13 years; the couple had Booth's other two daughters, Emma and Lauren Booth, a broadcaster and Journalist.