Nothing was being done to help the non-dopers, to encourage or support them. Even the clean riders like myself and Moncout knew how easy it was to cheat the tests.

I was awarded 'Most Aggressive Rider of the Day', generally given to the most spectacular loser of the day.

If you're not at the front, you're not in the race.

I might have changed, but that did not mean the sport had.

One group of riders doped, the others alongside them racing clean. You can work out for yourselves which group was fastest.

I had grown used to getting a pat on the back and being told after a good result: 'Well done, David - you should be happy, you're the first clean rider.

It was very quiet at the hotel, as if there had been a death in the family. When you have quit the Tour, nobody really knows what to say or do. (...) Everything I'd previously achieved meant nothing; all I was now was a pro rider who couldn't finish the Tour de France.

There will always be cheaters. It is human nature. It will never be 100 percent clean, in any sport.

In fact cycling has always been 'saved' by judicial investigations and not by the anti-doping controls we put in place. That's the harsh truth. We have relied on them to clean the sport up.