A fragile truce between Washington and Beijing has been brokered. The details remain blurry, but the message for Whitehall is clear: Britain's trade arteries now depend on navigating a superpower pincer movement.

The Prime Minister's phone hasn't stopped ringing. Number 10 briefers are spinning furiously, insisting London can play 'bridge builder' between the two giants. But seasoned diplomats roll their eyes. This is about survival, not diplomacy.

The real fear is a carve-up. A Trump-Xi deal that carves spheres of influence. The US locks down the Atlantic, China tightens its grip on the Pacific. Where does that leave a post-Brexit Britain? Stranded in the middle, reliant on goodwill the US and China no longer feel obliged to extend.

Internal memos from the Department for International Trade are panicked. They worry about losing preferential access. They worry about being squeezed out of critical technology markets. One senior official put it bluntly: 'We will be the meat in the sandwich, and they are both hungry.'

Cabinet is split. The 'Global Britain' faction sees opportunity. They argue that a truce reduces the risk of a conflagration that would sink the world economy. They whisper about new deals, new openings. But the realists, the old Foreign Office hands, see only hazard. They point to history: great power détentes always come at the expense of smaller powers.

The PM's own position is fragile. No majority. A restive backbench. An economy that refuses to bounce back. He needs a win. This summit offers an illusion of one. But the wire services are already carrying stories of Chinese officials warning against 'third party interference'. That's aimed squarely at London.

In the lobby, the chatter is about a brewing revolt. Tory MPs from leave-voting seats are nervous. They fear any deal that looks like weakness towards Beijing. Labour is circling, scenting blood. The PM's attempt to frame this as a strategic masterstroke is met with hollow laughter from those who know how deals are really done.

The bottom line: the UK must rapidly diversify its trade lanes. That means strengthening ties with the Indo-Pacific, with the Commonwealth, with Europe whether it likes it or not. The old certainties are gone. A superpower truce is not a comfort. It is a warning. And Whitehall had better heed it.