What happens if Parliament's approval for triggering Art 50 is needed?

On 3 November, the UK High Court ruled that Parliament must vote on Article 50. If the judgment ends up being upheld by the Supreme Court, what would the implications be? A video commentary by the UCL EI's Academic Director.
Piet Eeckhout (UCL Laws)
3 November 2016

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Piet Eeckhout on Parliament and Brexit from UCL European Institute on Vimeo.