Britain and the United States have successfully test-fired a heavyweight torpedo from an unmanned underwater drone for the first time, marking a significant advancement in Western military capability announced as Prime Minister Andy Burnham prepares for his first meeting with Donald Trump at the United Nations General Assembly in New York. The historic demonstration of the weapon—jointly developed by the US and Australia—is intended to bolster maritime security, though Burnham's visit is primarily focused on securing international cooperation on artificial intelligence, supporting Ukraine, and pursuing Middle East peace efforts.

The torpedo test comes amid considerable scrutiny of how Burnham will manage his relationship with Trump, particularly given that his predecessor's attempts to cultivate ties with the president deteriorated over tariffs and Iran policy. Burnham faces several potential flashpoints during the meeting, including Trump's likely questions about the UK's commitment to spending 3 per cent of GDP on defence, as well as Trump's previous suggestion that he would not prevent Argentina from seizing the Falkland Islands. Former diplomats have advised Burnham to be quick-witted and humorous whilst carefully managing expectations, given Trump's propensity to veer off agenda and discuss whatever is on his mind.