Graham Sharpe felt dizzy and his vision turned yellow then he fell, breaking his collar bone.
Luckily a heightened emergency services presence for presence for the US President's meeting with the King at nearby Windsor Castle meant paramedics were quickly rushed to his aid.
Graham, 65, said: "The police had put a message out that they needed a defibrillator and an armed response vehicle on standby nearby had one. It took two shocks to restart my heart.
"Joe Biden and his entourage were in Windsor that day to visit King Charles.
"So really I have both of them to thank for saving my life!" Graham, from Harrow, North West London, is supporting a final push towards victory for the Daily Express crusade Complete The Circuit.
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