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Paula Radcliffe has tweeted her thanks to the crowd who supported her during her last London Marathon.
She added that her memories "will last a lifetime and beyond".
What a day! Thank you to the crowds and streets of London and all the runners, memories that will last a lifetime and beyond.
Marathon world record-holder Paula Radcliffe ran her last ever race today, finishing in an impressive 2:36:55.
She might have won the London Marathon three times in the past - once in a blistering 2:15:25 - but this time she was just happy to finish, to huge cheers from watching crowds.
"I didn't care about the time all the way round and I just wanted to thank as many people as possible," Radcliffe told the BBC.
"I went off way too fast and then it got more and more emotional. It was just amazing the whole way round."
She said the "magic of the London Marathon" helped her finish.
Paula Radcliffe and Mo Farah are amongst some of Britain's athletes who have congratulated Tokyo on its winning Olympic 2020 bid:
yay so happy 2020 is in Tokyo :D
Around 15,000 people followed in the footsteps of medal-winning stars today when they took part in a race at the Olympic Stadium, crossing the finish line.
Olympic gold medallist Sir Chris Hoy joked that he had not taken part in today's National Lottery run at the Olympic Stadium because he is "better on wheels than on foot".
Sir Chris said the run was a chance to "thank the British public".
Marathon world record-holder Paula Radcliffe told ITV News that she was "excited" to return to the Olympic Stadium, as thousands gather to take part in the National Lottery Anniversary Run.
Radcliffe thanked the British public and Olympic committee for "continuing to support sports".