Despite a protest ban imposed by London Metro Police, demonstrators with the group Extinction Rebellion hit the streets of the UK capital to continue their disruptive civil disobedience campaign to try and force the government to do more to combat climate change.

The group and its affiliates staged dramatic and disruptive protests all over the world, especially in Melbourne and Sydney.  But the UK, cops called a ban on Monday after they arrested more than 1,450 people over more than a week of protests.

"After nine days of disruption we felt it is entirely proportionate and reasonable to impose this condition because of the cumulative impact of these protests," said Deputy Assistant Commissioner Laurence Taylor.  "This does not mean people are banned from protesting in London.  The condition applies specifically to the Extinction Rebellion 'Autumn Uprising'," the statement continued, "If Extinction Rebellion, or any other group, come to us with a proposal for lawful protests then of course we will discuss that with them."

The protesters were back in Trafalgar Square within hours on Monday.  And on Tuesday they were targeting MI5 headquarters and the Deoartment of Transport, where the group's co-founder Gail Bradbroo, was arrested.  When Wednesday rolls around to the UK, they say they'll be back while they demand a judicial review of the Met's "disproportionate and unprecedented attempt to curtail peaceful protest".

"Criminalising anyone who wishes to protest in any way against the climate and ecological emergency in London is disproportionate and an unprecedented curtailment of the right to protest and the right to free speech and free assembly," said Tobias Garnett of Extinction Rebellion's UK legal team.

Amnesty International condemned the blanket ban on the climate group's protests as an "unlawful restriction on the rights to freedom of expression and peaceful assembly".

And London Mayor Sadiq Khan doesn't seem convinced of the police response; he is "seeking further information" about the decision to impose the ban and why it was necessary.

"I believe the right to peaceful and lawful protest must always be upheld," said Mayor Khan.