Every season they spread 120-tonnes on the garden.

Much of this was already planned and subsidised under former US President Biden's Chips Act.On the walkway into the building are photographs showing Biden's visit in 2022, with the building site draped in the Stars and Stripes and a banner saying "a future Made in America".

"The semiconductor supply chain is global," says TSMC Arizona President Rose Castanares. "There's really no single country at this moment that can do everything from chemicals to wafer manufacturing to packaging, and so it's very difficult to unwind that whole thing very quickly."As for the semiconductor supply chain, tariffs will not help. The supply chain stretches all over the world. Whether it's the silicon wafers from Japan, the machines required from the Netherlands, or mirrors from Germany, all sorts of materials from all around the world are required. Now, they could face import charges.That said, TSMC's boss was quick off the mark in confirming the expansion of the US site at an event with Trump at the White House. In recent weeks, America's tech elite - from Apple's Tim Cook, to Nvidia's Jensen Huang - have been queueing up to tell the world that TSMC Arizona will now produce many of the chips in their US products.

The global chip industry is very sensitive to the economic cycle, but its cutting-edge technology enjoys very healthy margins, that could cushion some of these planned tariffs.There are many geopolitical subtexts here. The factory sits at the heart of US strategy to gain technological, AI and economic supremacy over China.

Both the Biden and Trump administrations have developed policies to try to limit Chinese access to the frontier semiconductor technology - from a ban on exports to China of ASML's machines, to new legislation to ban the use of Huawei AI chips in US software or technology anywhere in the world.

Taiwan's President Lai this week urged democracies such as Japan and the US to develop "non-Red" supply chains to counter China.There is a wide range of Chinese investment in the UK, ranging from critical energy and transport infrastructure, to stakes in private companies and football clubs.

Significant Chinese investments in UK infrastructure includeby the China Investment Corporation, a sovereign wealth fund wholly owned by the Chinese state.

The Hong Kong-based industrialist Li Ka-shing's investment group, which operates electricity distribution infrastructure across London, the South East of England and the East of England.