Eighteen people have been charged in relation to that incident, which includes allegations of assaults on a security guard and two police officers.
The individuals have all denied wrongdoing and trials start later this year.
Government papers in the legal challenge, brought by Ms Ammori reveal police chiefs told the Home Office the network’s activity was “unaffected” by ordinary criminal investigations.
“Operationally, existing legislation is seen as insufficient to address high-level offences, which meet the definition of terrorism,” officials wrote in March.
“There is currently no existing legislation to deal with [PAG] holistically, meaning the network can only be dealt with on a case-by-case basis in response to isolated incidents of direct action.
“From the perspective of regional police forces, it is argued that this fractured case-by-case approach has proven operationally ineffective, considerably limiting preventative and disruptive opportunities.”
The police argued banning PAG would help prevent crime – but they also warned that it could look like “state repression” and the use of “draconian counter-terrorism legislation”.