“the evidence on which the crown relied to argue for the secret trial could not be presented in open court”

“This appeal raises important issues relating to the constitutional principle of open justice but also the equally important principle of fairness and natural justice,” Hudson told the court.”

Major terrorism trial could be held in secret for first time in UK legal history | Law | theguardian.com.

This culture of secrecy and non-accountability towards the public is a hugely growing and worrying Orwellian trend.