We haven't even managed yet to leave the EU - and may not do so at all - but Whitehall is quietly preparing for the inevitable inquiry into how it all became an almighty cockup. The government have screwed up from Day One - from May's throwing away the announcement of the start of Art 50 for a minor personal political advantage, to her refusal even at this stage to allow contingency arrangements for leaving without an agreement. Plus giving away all the significant advantages before talks even started, falling into trap after trap, allowing the EU to hold the UK to ransom over our territorial borders, and the deception and mendacity around May's parallel treaty, the Robbins Treaty, which, it is suspected, the EU saw before May's own cabinet. The entire process has been one of gross incompetence, crass maladministration and indictable misconduct.
Once the documents are sequestered, long interviews under caution completed and statements collected from all the third-tier actors down (and it's always the telling, detailed evidence from these people that sinks the big fish) the senior mandarins and May and her cabinet members will face their public grilling in the witness box.
This, I'm quite sure, is the motivation behind Oliver Robbins' leaked letter. Why write to the PM to tell her that the treaty was fatally flawed when both of them know that too well already? Robbins is getting his retaliation in first - in an effort to ensure May doesn't pass the blame to him.
We need to wait for the inquiry, of course, and it will be little satisfaction to those who have warned of May's malfeasance, incompetence and unsuitability for this critical role from the start. We all want the best outcome for our nation much more than we want to see Theresa May broken, humiliated and spurned. But this will come. I cannot see how she can escape formal national excoriation and dismissal to obscurity without honours. But again, let the inquiry do its job.