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It was initiated partly in response to the furore caused by Enoch Powell 's 1969 ‘ rivers of blood ’ speech , much as disturbances at the 1976 Notting Hill Carnival prompted further steps on the part of the Department of the Environment — ‘ A riot makes a much bigger impact on government thinking ’ , as Donnison ( 1987 ) has pointed out , ‘ than any amount of earnest and accurate research ’ .