Tensions remain high ahead of a royal state visit, with reports the US could review its stance on the UK’s claim to the Falklands.
Josh Fenton-Glynn will run the 26.2 miles through the capital in memory of his brother, Alex English, who died in January 2025 from a rare cancer.
Argentina has long claimed sovereignty over the Falkland Islands and invaded them in 1982 before being defeated in a short but bloody war.
The King and Queen are due to arrive in the US on Monday for a four-day visit during which they will meet President Trump.
The Duke of Sussex has said he will always be part of the royal family during his surprise visit to Ukraine, adding he is in the war-torn country “doing the very thing that I was born to do”.
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