among them will be sir mo farah, who may feel particularly emotional when he reaches the finish line, after confirming this will be the last marathon of his career — asjoe wilson reports. this is where it ends. it's where it began. from a school boy mini marathon champion, london �*s witnessed over 20 years of sir mo farah's career. 26 more miles today in his final marathon. i wonder in a way, mo, whether you can relax and enjoy this one in a different way. do you think so? i think that is the key thing, just enjoy it and make the most of it. as you said, a marathon is a long way. and i think for me seeing the crowd and so many people supporting you does make a difference. and there is no better place than london. if there are some anxious runners in the mass field, don't worry, they're in good company. making her marathon debut, sifan hassan, on the track a double olympian champion.