Thread from Jo Maugham (italics). Looks like they have anticipated the attempt at getting an EU27 member to veto.
There is, so far as I can see, still one, and only one, way through for the Government to 31 October. If they can cause an r27 to veto the extension the statements to the court are fine and the PM gets to deliver his promise.
This way through involves them sending the letter, as they told the court. And it involves them frustrating the Benn Act as a matter of law but not in such a way as to breach the carefully crafted obligation they offered to the Court
We spotted this point late in the day and pushed the Court for an order in the terms of the below.
encouraging (or causing to be encouraged) any other Member State of the European Union either directly or indirectly to disagree with any proposed extension of the period under Article 50(3) of the Treaty on European Union ending at 11pm on 31 October 2019 (from screenshot of court document)
We were assisted in this regard by the rather helpful (from our perspective) statement a "senior Downing source" gave to @bbclaurak. We put this before the Court which, I believe, immediately appreciated the gap in the PM's proffered undertakings.
But the government is not prevented by the Act from doing other things that cause no delay, including other communications, private and public. People will have to wait to see how this is reconciled. The government is making its true position on delay known privately in Europe and this will become public soon. (from screenshot of Downing Street source in Laura Kuenssberg tweet)
If (as I now expect) the Court orders that the PM not frustrate or thwart the terms of the Benn Act in the terms we have sought then (I believe) the Government is screwed. We will not be able to make good on whatever we might have promised eg Hungary and they will know it.