This from the Guardian (with additional links):
The UK supreme court has ruled that the government must seek approval from parliament to trigger article 50 that would begin Britain’s exit from the European Union. The Guardian is covering the landmark decision announced on Tuesday, live. The court ruled by a majority of eight justices to three against the government’s appeal of an earlier decision by a lower court that ministers must vote on the terms of a Brexit deal. The ruling is a blow to UK prime minister Theresa May and upends her timeline for Brexit. A government spokesperson said the government remains confident that it will get the backing of parliament. “We respect the supreme court’s decision, and will set out our next steps to parliament shortly,” the spokespersons said. Here are the key points of the decision.