Dina Asher-Smith hurtles to historic treble as GB win relay silver in Doha

• Sprinter is first Briton to win three world championship medals• GB men and women teams each take second place in 4x100m Dina Asher-Smith put one last dollop of icing on her stunning week in Doha by winning another silver medal in the 4x100m relay - and become the first British athlete ever to win three medals at one world championships. Asher-Smith, who glided to gold and silver in the 200m and 100m respectively earlier in the week, ran a storming second leg as Britain's women took silver...