As I have explained before, Parliament could always debate and vote on leaving the EU any time it liked. Yesterday the Opposition got round to tabling a motion on Article 50 and we had another all day debate on the EU as we have several times since the referendum in government time.
The Commons voted by a majority of 373 to send a letter before the end of March, as I assumed it would. Only the SNP and LIb Dems voted in any numbers against.
I trust the Supreme Court will now understand two things. One is Parliament can and does debate and vote on what it wishes. Two, there is a very large majority for carrying out the wishes of the UK voters and sending the notification of our departure
The Supreme Court case is even more of an irrelevance after yesterday.