by Kieran Canning  LONDON, United Kingdom (AFP) — Virtually untouchable when on song, breaststroke king Adam Peaty spearheads a potent British team when the world swimming championships begin on Sunday in Gwangju, South Korea. The world record holder over 50 and 100 metres, Peaty will be the red-hot favourite to retain his world titles but Britain’s supporting cast also contains plenty of quality. Duncan Scott is a sure-fire medal contender after backing up his […]