Relief poured out of Adam Peaty after he became the first British swimmer to retain an Olympic title with a characteristically dominant display in the final of the men’s 100 metres breaststroke.While he was unable to break his own world record of 56.88 seconds, the 26-year-old from Uttoxeter stormed to Team GB’s first gold of Tokyo 2020 by clocking 57.37secs, the fifth fastest time in the event’s history.His supremacy therefore remains unchallenged with closest challenger Arno Kamminga, the only swimmer other than Peaty to breach the 58-second barrier, finishing a distant 0.63s behind.