The UK Home Office defends ban as necessary for national security, while lawyers warn of impact on civil liberties

Government appeal against high court ruling could have implications for right to protest and lead to other groups being proscribed

Appeal lodged on Tuesday calls on courts to reinstate a ban on the direct-action group, which had previously been designated under UK’s terror laws

The UK Home Office defends ban as necessary for national security, while lawyers warn of impact on civil liberties