He was the son of Lionel Brett, 4th Viscount Esher and his wife Helena Christian Pike, a painter.
John Higgins of The Times not long after detected a political streak in Brett's journalism, and dismissed him.
The gallery grew out of the Centre for Advanced Creative Study (CACS), run in 1964 in Cornwall Gardens, London, from the flat shared by Keeler and Medalla.
[7] Supported also by Gustav Metzger and Marcello Salvadori, CACS moved in November 1964 to premises at 39 Wigmore Street owned by Paul's father Charles, renamed as Signals London.
[7] Signals showed Sérgio de Camargo, Lygia Clark, Li Yuan-chia, Hélio Oiticica, Jesús Rafael Soto and Mira Schendel, as well as Takis.
When Signals closed in 1966 it left some legacy of artists with the Indica Gallery of John Dunbar and Barry Miles.
[16] An AFD exhibition in 1974 received backing from the Chilean academic and diplomat Álvaro Bunster, Harald Edelstam and Judith Hart.
[17] It was at an AFD meeting in 1976 that Gavin Jantjes met Barry Barker of the Institute of Contemporary Arts and was able to exhibit there.