Original sentence: Some refused to do so and were forced back into the kettle by police.When police started to allow protesters to leave the kettle, they were photographed by Forward Intelligence Teams and told to give their names and addresses (which they are legally not required to do)
Edited sentence: Those who refused to do so were forced back into the kettle by police.When protesters attempted to leave the kettle, they were photographed by Forward Intelligence Teams and told to give their names and addresses (which they are legally not required to do)