As it is now in court we will haev to wait for the result.
My money is on the Government winning. I support Brexit but although it's finely balanced I think the law favours the Government's side - no Parliamentary approval needed to serve the Art 50 notice.
Today , Thursday, 16 QCs and 20 - 30 solicitors in the High Court where it will all be happening. www.ft.com/content/91712c72-908b-11e6-8df8-d3778b55a923