The move follows an appeal by Elizabeth Johnson, Constable Blakelock's widow, who has written to Sir Paul Condon, the Commissioner of the Metropolitan Police. She wrote in response to the recommendation in the Stephen Lawrence inquiry that unsolved murders should be re-examined for new evidence.
PC Blakelock died of multiple stab wounds after being attacked by a mob on the Broadwater Farm Estate, Tottenham.
PC Blakelock's wife, who has remarried, told Police Review magazine: "I have every sympathy for the Lawrence family because I know what they are going through and I think it is right for the Commissioner to make such a promise but you just can't help saying, `What about us?' I haven't given up hope that they will catch Keith's killers. Although I have never been one for causing a fuss, I feel that I would be letting Keith down if I don't do something."
Winston Silcott was convicted of the murder in 1987 but later acquitted after evidence showed that police notes of an interview had been altered.Engin Raghip and Mark Braithwaite were also cleared. Silcott remains in jail because of a conviction for another killing.