I'm confident of what I have to achieve in the buildup to London 2012.

I've had a lot of success over the years racing in New York, but the main point is that I feel the marathon is a different event, a lot more my event.

I've always been good at putting things behind me–I fall apart, do my crying bit, and then put it away and move on.

The cheats always have a way of justifying their behaviour - everyone else is getting away with it, so why shouldn't I? But because they're so reliant on the drugs - and the drugs are not always perfect, you're not guaranteed to peak at a big event - they don't have the confidence to look in the mirror and know that they can go out and give their best. If you're clean and you've prepared well for a race, that's where you have an edge.

I try not to worry about things that I can't control.

No one remembers who came fourth.

An Olympic medal won't define my whole life, although it might look like it to onlookers. When I look back, I should have been able to get an Olympic medal.