Mo Farah faces new challenge on his return to the London Marathon

After finishing eighth - and in pain - four years ago Britain's most successful athlete now has to contend with Eliud Kipchoge, the Olympic champion, and Kenenisa Bekele The promise came shortly after Mo Farah had crashed into the steepest of walls, limbs screaming and pride shredded from the loneliest of trudges towards the finish of the 2014 London marathon. "I will be back," he insisted. "I want to know that I can run a great marathon as well as achieve medals on the track." On Sunday, the mo...