So as usual I am very confused.

The thing is that literally minutes after being told unambiguously by someone close to Theresa May that there was no way she would provide any serious detail on her Brexit vision before triggering Article 50, she apparently caved in to pressure from MPs and has agreed to publish a "plan".

And understandably Labour is celebrating what it feels is a rare victory.

But I fear Labour's joy, along with that of EU-loving Tories such as Anna Soubry, may be a bit previous.

Anna Soubry Credit: PA

I am reliably told that the Prime Minister's plan will be very high-level principles of the kind we already know, such as that we will reassert control of our immigration policy, we will no longer be subject to the jurisdiction of the European Court of Justice, we will take back control of most of the money we contribute to Brussels and we will assert the right to negotiate bilateral trading deals with other countries.

Now on Peston on Sunday two days ago, Boris Johnson described these four points as "providing a wealth of information about what Brexit will look like".

Which I am not sure is the most brutally honest statement he has ever made.

Especially since the Prime Minister continues to insist she wants maximum access to Europe's single market, and refuses to confirm we would be leaving the customs union - even though, as I and others have pointed out boringly often, it is close to impossible to reconcile sustaining our frictionless and costless trade with the EU while simultaneously taking back control of borders, law, extra-European trade and money.

Slice of Brexit cake? Credit: PA

Every EU government head and official has said unambiguously we will not get our Brexit cake and continue to be able to dine on exquisite single-market gateau.

That said there is no chance of May telling us any time soon where she will compromise, what she'll take if not EU sweetmeats.

What is not widely understood is that the Prime Minister believes that probably the worst mistake ever made by her predecessor, David Cameron, was to write to the president of the EU Donald Tusk setting out what he wanted from his own negotiations with the EU - which were supposed to provide us all with a good reason to remain in the EU.

Former Prime Minister David Cameron. Credit: PA

By doing so, Mr Cameron showed both the poverty of his ambition in respect of his negotiating aims and set himself up to be knocked back by other EU government heads.

Which led directly both to his referendum failure and his political demise.

So although Ms May is under enormous pressure even from her own MPs to tell us what she really really wants in the Article 50 negotiations, she will not bend to them.

Because to do so, the Prime Minister fears, would be to set herself up for career-destroying failure.