Crimestoppers UK and learnt about the Crimestoppers scheme, he saw it as a good opportunity to get the community involved in crime-fighting. Other areas around the UK also learned of Crimestoppers and took it up around this time but there was no national, co-ordinated approach. In 1985, PC Keith Blakelock was murdered during the riots at the Broadwater Farm Estate in London and the police appealed for information, stating that people knew who had been responsible but were frightened of coming forward. Michael Ashcroft (now Lord Ashcroft, KCMG and Chairman of the Trustees of Crimestoppers), a businessman, offered to provide the police
The Hard Stop Marcus Knox-Hooke and Kurtis Henville, against the backdrop of their home on Broadwater Farm — an estate that notoriously was the scene of a 1985 riot triggered by tensions between the police and local black people — the film follows the journey of the two young black men over 24 months, until the 2012 verdict that found Duggan to have been "lawfully killed". Marcus Knox-Hooke was accused of being the instigator of the 2011 riots and, though that charge was dropped, he was sentenced to 32 months' imprisonment following a prosecution for other offences. Producer Dionne Walker has said: "We