…about what it was exactly it was that made the 9th Doctor decide to leave the series after only one season:
“I was open-minded but I decided after my experience on the first series that I didn’t want to do any more,” he said.
“I didn’t enjoy the environment and the culture that we, the cast and crew, had to work in.
“I thought if I stay in this job, I’m going to have to blind myself to certain things that I thought were wrong.”
Now that is a VERY interesting statement since it directly contradicts Russel Davies interview of last year:
Was Christopher Eccleston always only going to do it for a year?
That was always the plan, and then the plan got fumbled because the newspapers found out about it. Can you imagine what a shock that regeneration would have been if they hadn’t known? We got better at that over the years, found ways to keep other secrets. Nonetheless, Chris Eccleston is just a blazing comet of talent, and we are lucky to have had him for even a short time. I’m so grateful to have had him.
Someone is not telling the truth. And fans would like something a more definite answer:
I’m a tad frustrated by this. A bit like the Katy Perry storm in a bra-cup yesterday, this is only half a story. The whole story would be exposing exactly what Eccleston had a problem with that caused him to quit – and why does this conflict with the reports that he only intended to do one season anyway? Somebody needs to pin him down and get a straight answer.
I think not, I suspect a more definite answer will get him blacklisted.
Via Sparky mark at the Doctor Who Livejournal forum
Da Techguy's (no longer backup) Blog 
Why does one person have to be lying and the other telling the truth?
If ratings are as important in the UK as in the US, then Dr. Who might have been given one season to prove itself. Mr. Eccleston would then have a one year contract. As the show progressed, ratings might have been a reason for another season. Mr. Eccleston, who only signed for one season, is asked to sign for the second and chooses not to. I don’t think Mr. Davis or Mr. Eccleston really needs to give an explanation for their actions. As fans we would like to know, but in the grand scheme of things do we really need to hound them for it?
I don’t think we need to hound him at all, but according to Davies the plan was always to have him for only one year, yet Eccleston said he decided not to stay for other reasons. That is the someone is not telling the truth bit.
How or why he stayed or went was totally up to him.