Relevent bit is under the Trail section:
"On 12 May 1975 the six men were charged with murder and conspiracy to cause explosions."
"Forensic scientist Dr Frank Skuse used positive Griess test results to claim that Hill and Power had handled explosives"
"The system working" here in the UK unfortunately can mean serving only 16 years in prsion before a conviction is overturned: http://en.wikipedia.org/wiki/Birmingham_Six