Long before our intrepid marathon swimmers took on the Marathon 10k, Half Marathon 5k and 1k Challenge at the London Aquatics Centre, on Queen Elizabeth Olympic Park - marathon swimming in London was a sport that captured the public's attention. The Thames was the venue and thousands would gather to watch extraordinary feats by legends such as Captain Matthew Webb, Annette Kellerman, Mercedes Gleitz, David Williams and Lewis Pugh, even Lord Byron and Benjamin Franklyn were kn