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As I recall, Article 50 only works if the exiting member gives notice in accordance with its own constitutional requirements. If notice is given unconstitutionally, it is invalid. I also recall that in those circumstances, the EU may be able to suspend/revoke membership without notice - which may be rather inconvenient if we still haven't, as a country, worked out any alternative arrangements. The longer term future in those circumstances may be very positive, but the short to medium term could be uncomfortable, at least.

If I remember aright therefore, it is in everyone's interest to make sure that all the constitutional niceties are observed in Brexit, or else Brexit may be ineffective, or, possibly, at the discretion of the EU. As three distinguished judges have ruled that the Government cannot use the Royal Prerogative to give effect to the referendum result, there is clearly a problem. It is surely in the interest of all, in particular those favouring Brexit, that this problem is resolved beforehand. Otherwise Brexit could be ineffective. Given the passion the whole saga has generated, chaos and 'civil disobedience' could in that event very likely result.

Given the passion also, it would surely be a brave and almost suicidal politician who would not strive to give effect to the referendum result. Politically, if Parliament does not go with the referendum result, the Government is surely likely to call a general election to get a Parliamentary mandate. Of course the Fixed Term Parliaments Act may make that difficult, and then where will we be?

Truly these are very interesting times.