Best-selling U.K. author Terry Pratchett has received the consent forms necessary to initiate the process of ending his life from Switzerland’s Dignitas clinic. Pratchett, who suffers from Alzheimer’s disease, says the only thing preventing him from signing the documents is that he has “a bloody book to finish.”

Last year, Pratchett delivered the Richard Dimbleby Lecture, in which he argued that the U.K. should set up special tribunals to allow people suffering terminal illnesses to seek assistance in ending their lives. At the time, he said that if he knew that he could die whenever he wanted, “suddenly every day would be as precious as a million pounds.”

According to the Guardian, Pratchett’s decision to begin formal proceedings toward ending his life does not mean that he has made a final decision on the matter.

Pratchett, the creator of the Discworld novels who was 60 when he was diagnosed, said his decision to start the formal process did not necessarily mean he was going to take his own life.

According to Dignitas, 70% of people who sign the forms do not go through with taking their own lives.

Meanwhile, the BBC’s decision to air Choosing to Die, a documentary that Pratchett made featuring, in part, the assisted suicide of 71-year-old hotel magnate Peter Smedley, is causing controversy for being “pro-euthanasia propaganda.” From an article in the Toronto Sun:

“This is yet another blatant example of the BBC playing the role of cheerleader in the vigorous campaign being staged by the pro-euthanasia lobby to legalise assisted suicide in Britain,” said Peter Saunders, a spokesman for the group Care Not Killing.

“The BBC is actively fuelling this move to impose assisted suicide on this country and runs the risk of pushing vulnerable people over the edge into taking their lives. It is also flouting both its own guidelines on suicide portrayal and impartiality.”

For its part, the BBC said that Pratchett’s film is about one man’s decision, and viewers must decide for themselves where they fall on the issue.