AFTER protracted parliamentary debate, the bill authorising the prime minister to invoke Article 50, the legal basis for leaving the European Union, finally became law this week. Late on March 13th the House of Commons rejected two amendments that had been proposed by the Lords. As expected, the upper house then backed down. The government had been hinting broadly that the letter triggering Article 50 would be sent to Brussels immediately. On March 14th Mrs May duly hailed the bill's passage into law as "a defining moment for our whole country".
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