The case of the extraordinary Ratcliffe Power Stations convictions shows how very wrong this can go. The courts have ruled not only that the police acted as agent provocateur, but that police colluded with our supposedly independent prosecutorial service to withhold vital information from the court.

The lord chief justice was among the appeal court judges who published this yesterday:

“It is a case which has given rise to a great deal of justifiable public disquiet, which we share. Something went seriously wrong with the trial. The prosecution’s duties in relation to disclosure were not fulfilled. The result was that the appellants were convicted following a trial in which elementary principles which underpin the fairness of our trial procedures were ignored. The jury were ignorant of evidence, helpful to the defence, which was in the possession of the prosecution but which was never revealed. As a result justice miscarried.”

The court here is making a stand against the contempt for political liberty that emanated from the very top of the Blair government and spread to affect the policy and operations of all governmental institutions in the UK. The mindset that made it OK for the government to set up young environmental activists, was no different from the mindset in which MI5 agents thought it was OK to collude in the torture of Binyam Mohammed.

But here lies the rub. The appeal court is trying to right the wrongs done to middle class white people. The amount of infiltration and agent provocatuer activity against “Muslim extremists” has been of a much higher order. The “fertiliser bomb plot” is one example of an attempted crime by deluded people who had been penetrated and very probably egged on from the start. The “airline bomb plots” and “Manchester Easter bomb plots” both involved the shadowy double agent Rashid Rauf.

Furthermore, precisely that openness by the prosecution the appeal court demands is deliberately denied to Muslim defendants on terrorist charges, who are frequently not allowed to see and thus to challenge the provenance of “Evidence” against them by the security services.

There has, thankfully, been a steady stream of overturning of crazy “terrorist” judgements on appeal, including the truly appalling conviction of the woman for writing “terrorist poems”. But it nonetheless remains true that we are yet to recover sufficiently from the Blair poison to give the full benefit of law to Muslims in the way we have just done to middle class white people.