Intro:

Briton Mo Farah says he will retire after the London World Championships in 2017. The outdoor track season gets under way in Doha this weekend.

Script:

SOUNDBITE: (English), Mo Farah (on his future):

"I don't know, just see what happens in terms of my career. As Sally (Pearson) says, sometimes we take it for granted. Athletes get a lot of injuries and it is important you improve your times and keep improving each year, stay injury free. My aim in my career is to continue collecting medals for my country, which I love doing that. But at the same time, sometimes your time is up, you might have to hang your spikes up. But I want to carry on until probably 2017 London World Championship and maybe after that go on to the marathon."

SOUNDBITE: (English), Mo Farah (on possible night marathon at 2019 World Championships):

"The night marathon, if it is proven it is better for us in terms of climate and everything else then why not? We've got to try something and I think sometimes I look at athletics and I am like, 'how do we make it exciting?' I think it can be exciting if we work together and build on it. Because all the time you see football on TV - and I love football, even last night I stayed up to watch the match. So it's important that we give back something to the sport and to build athletics. I want to be able to see it in terms of, like, back in the day, Coe and Ovett, broken records. British public getting behind you again."