He was (and remains) closely connected with the British avant garde poetry scene of the 1960s and 1970s – authors such as Edward Dorn, J. H. Prynne, Douglas Oliver, Peter Ackroyd and Brian Catling are often quoted in his work and even turn up in fictionalized form as characters; later on, taking over from John Muckle, Sinclair edited the Paladin Poetry Series and, in 1996, the Picador anthology "Conductors of Chaos".