Nicky Jacobs has been freed from prison after he was cleared of the murder of Pc Keith Blakelock during the 1985 Tottenham riots.
The 45-year-old was driven from Belmarsh prison in south east London this morning after administrative processes delayed his release.
Speaking outside the prison, his lawyer Tony Meisels said his client was "relieved" to be free after the four-year ordeal.
"Questions need to be asked at the very highest levels of the Crown Prosecution Service and the police as to why this prosecution was ever brought," Mr Meisels added.
More top news
Della Callagher died and 32 other diners became seriously ill after eating the poisonous yuletide meal.
The ex-Tory MP's rant was secretly recorded on the driver's phone and published in The Sun.
You dash to the platform, desperate to get home but find out you've got a few minutes to spare before the next Tube. What do you do?