It's important that athletes can compete on a level playing field. And youngsters coming into the sport can know that if they are working hard and training hard, they'll see a true reflection of where they stand and what they can achieve worldwide and not be swayed by people who are cheating.

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 used to say that the newspapers were tomorrow's fish and chip paper, but I didn't really mean it; I could still be hurt by what they said. After Athens, I just didn't care.

I am not driven by any bitterness by what happened in Athens. I learnt a lot of lessons from it and probably came through it a stronger person in the end. There have been a lot of near misses, and that's taught me to keep persevering and that there is a chance it can come right.

I would be happy with an Olympic bronze. What I don't have is an Olympic medal.

If you look back at my marathons and ask whether I would swap one of them for my one balls-up, of course I would. But you can't choose. You have to make the best of it on the day.

We, as athletes, have our suspicions about who's cheating, but I'm not convinced that the testing has yet caught up with what people are using or what they are using to disguise it.