Sport UK- August 21, 2015

In this week’s Sport: The Bolt Ultimatum: how will athletics survive once its biggest star crosses his final finish line? | Dina Asher-Smith: Britain’s fastest woman on breaking the 11-second barrier and catching the world’s best sprinters | Aaron Cresswell: West Ham’s Mr Reliable has high hopes for the Irons’ final season at Upton Park | Guillem Balague’s on the new La Liga campaign | Jonny Wilkinson talks finding peace and autographing pets | England hockey captain Kate Richardson-Walsh looks forward to the EuroHockey Championships at London’s Olympic Park | England all-rounder Natalie Sciver reflects on her Ashes campaign | Plus: ultra-runner Robbie Britton sees the funny side of dogging and mugging.