Gordon Brown's name was written on the side of the chimney

Eight women and 12 men were initially freed pending a Crown Prosecution Service decision. A further four were bailed on Wednesday afternoon.

During the incident, the name of the Prime Minister was painted on a chimney and equipment was temporarily halted.

The 36-hour protest was over E.ON UK's plans for new coal-fired units.

The company wants to build a plant on the Kingsnorth site that could supply electricity to 1.5 million homes.

But Greenpeace says it will pump carbon dioxide into the atmosphere and claims it will create a precedent for more coal plants in the future.