Neil Stein was reportedly the second player to win the British Go Championship, the first being John Barrs. Apparantly he was 1 kyu in those days. At the time the championship was rather unofficial in nature, so it is not recorded in the official BGA history pages. It is recorded in Francis Road's British Go Championship song though, which may be more reliable.
He represented the BGA at the first world amateur tournaments in 1963 and 1964. Later in life he switched to playing scrabble, his record game score being 668.
He has also appeared on some UK TV gameshows such as 15 to 1, Countdown and, most successfully, Crossword, on which he stayed for 11 weeks.
His Obituary is published on the BGA website