I just looked up the latest trade and investments factsheet[1] and there are some interesting deets. If you're wondering about direct investment in the US as well as imports:
- Total UK imports from United States amounted to £111.5 billion in the four quarters to the end of Q3 2024 (a decrease of 5.1% or £5.9 billion in current prices, compared to the four quarters to the end of Q3 2023).
- In 2023, the outward stock of foreign direct investment (FDI) from the UK in United States was £494.1 billion accounting for 26.7% of the total UK outward FDI stock.
In addition to direct investment I would also count portfolio investment since we're sort of involved at an individual level through our workplace pensions (and/or personal), savings, stocks and shares ISAs, and so on. A preliminary report[2] foreign holdings of US securities as of June 2024 puts the UK as the top holder at over 3 trillion USD.
1. https://assets.publishing.service.gov.uk/media/67b6f8efbd116...
Also "Total UK exports to United States amounted to £182.6 billion in the four quarters to the end of Q3 2024 (a decrease of 0.5% or £889 million in current prices, compared to the four quarters to the end of Q3 2023);"
Which is why the current government is being particularly cautious at the moment.