Hmmm, am I really going to the graun...Here is the most incendiary paragraph, in which the No 10 source implies the UK would withhold cooperation from any EU countries that support a Brexit extension. The source says:
"We will make clear privately and publicly that countries which oppose delay will go the front of the queue for future cooperation — cooperation on things both within and outside EU competences. Those who support delay will go to the bottom of the queue. [This source also made clear that defence and security cooperation will inevitably be affected if the EU tries to keep Britain in against the will of its government] Supporting delay will be seen by this government as hostile interference in domestic politics, and over half of the public will agree with us".
Internal message allegedly from the unelected Cummings. Starting to wonder if this bloke has a vested interest. His acidic tone is so persistent
...https://www.theguardian.com/politics/2003/jun/18/labour.whitehall