Lawyers supporting Extinction Rebellion have been granted an emergency High Court hearing in regards to the Met Police "ban" over the group's protests.
An application, backed by a number of politicians as well as activists, was submitted this morning and a spokesman for Extinction Rebellion said it has now been accepted.
The case will have a initial hearing tomorrow from 2pm.
XR said the group will be arguing that the conditions represent "an unprecedented and disproportionate curtailment of the right to free speech and free assembly".
It said the measures "risk criminalising protest about the climate and ecological emergency in the capital".
A spokesman added: "XR hopes that the High Court will quash the police's decision, ruling it unlawful."
It comes after the Met Police said anyone involved in "autumn uprising" protests in the capital would face arrest.
Police argued that the move was warranted and does not constitute a ban.
Green Party peer, Baroness Jenny Jones said: “A collection of Climate rebels, including Parliamentarians such as myself, Caroline Lucas MP and Ellie Chowns MEP, are taking the Met Police to court to challenge the Section 14 Order which bans Extinction Rebellion Protests throughout the whole of London.
“We believe that the ban is an abuse of the law and in violation of fundamental human rights. Our lawyers are seeking an emergency hearing this afternoon and we expect that the Court will rule the ban null and void.
“Until the Court rules otherwise, the police are still arresting anyone in a group who expresses, in words or otherwise, any concern about the climate and ecological emergency."
Deputy Assistant Commissioner Laurence Taylor, who is leading the policing of the demonstrations, said he is "completely comfortable" with the action the force has taken.
Lawyers for XR were at the High Court on Wednesday to apply for a judicial review of the ban amid claims that the order is not legal and breaches the right to protest.
Mr Taylor said: "We are very confident that what we've done is entirely lawful, entirely proportionate in the circumstances, and we are completely comfortable with the position that we maintain.
