Career
His autobiography, The Key To My Cell, put forward his version of events, and what he considered "the real conspiracy" — that the arrests were part of a plan to intimidate the trade union movement. Warren was regarded as an energetic strike leader. His death in 2004 from Parkinson"s Disease has been linked with the long-term effects of the treatment he received during his incarceration, in particular the "liquid cosh" – a cocktail of tranquilisers administered to inmates.
On 4 July 2009, a march was organised in Shrewsbury, by the local trades council and the Justice for Pickets campaign, starting from the Abbey, and finishing at the Lord Hill"s Column, where the demonstrators were addressed by several speakers.
As of 2013, Ricky Tomlinson continues to campaign for Warren"s name to be posthumously cleared, along with his own. He campaigned against the convictions at the Durham Miners" Gala in July 2013.