I returned to Imperial College, my alma mater, to attend the 60th birthday dinner of Felix, the college newspaper. As I am being sued for libel at the moment, it was interesting to hear that the threat to free speech also has an impact on student journalism. The newspaper's motto is "Keep the Cat Free" and it has always been willing to criticise the student union, but last year the union's constitution was used to prevent the publication of certain articles. In response, the editor modified the newspaper's cat logo to show Felix gagged with a red snooker ball.

The British Chiropractic Association's case against me has dominated my life for the last 18 months. I met my legal team, Adrienne Page and Robert Dougans, to work out the key research projects. We were recently given permission to appeal over an adverse ruling on the meaning of my article and the date for the appeal has been set for 22 February. Winning the appeal (even partially) will make an enormous difference to my chance of defending my article about the lack of evidence concerning chiropractic treatment of childhood asthma, ear infections and colic.

The appeal decision on meaning (the preliminary stage of the legal process) will eventually come almost two years after the article was published, so the trial and further appeals could lead to a battle that lasts for another two years. I will battle on even if I lose the appeal.

One reason for continuing is that my case helps to highlight some of the problems at the heart of the English libel system. Legally, the odds are stacked in favour of claimants and against journalists. Financially, the costs are so utterly extreme that journalists often cannot afford to defend themselves, hence apologies are given and articles retracted, even if the journalist believes that the contents are accurate.

The result is that those with money and power can sue journalists, scientists, medical researchers, academic journals, bloggers, local newspapers and even national newspapers and effectively silence them. The end result is that you do not get read the whole truth.

On Wednesday, there was the launch of a campaign for libel reform, which was followed by a parliamentary launch. It was amazing to see such an eclectic mix of supporters speaking up for libel reform, including Fiona Godlee (British Medical Journal editor), Dave Gorman, Malcolm Grant (provost of University College, London) and MPs from all the major parties, including Evan Harris, Michael Gove and Denis MacShane.

The roots of the campaign can be traced back to humble beginnings in May, when the charity Sense About Science began rallying scientists and the blogger Jack of Kent organised a pub rally in support of libel reform. In parallel, Index on Censorship and English PEN published a report on libel reform. So far, however, the mainstream media have largely ignored the issue, but last week there was some good coverage of the campaign launch and let's hop that will continue in the months ahead. The highlight of my week was waking up to see Dara O'Briain arguing for libel reform on the BBC's Breakfast news.

I will not go into all the gory details, but the bottom line is that England is universally acknowledged as having the most censorious libel laws in the free world. In 2008, the United Nations Human Rights Committee criticised the UK because the "practical application of the law of libel has served to discourage critical media reporting on matters of serious public interest, adversely affecting the ability of scholars and journalists to publish their work, including through the phenomenon known as 'libel tourism'".

America is in the process of protecting its citizens from our unjust libel laws by stating that English libel judgments cannot be enforced on the other side of the Atlantic. In the meantime, major American publishers have suggested that they will stop publishing in the UK and block internet access to their sites in order to protect themselves from our libel laws.

In mainland Europe, legal experts ask why our libel process is more than 100 times more expensive than in their own countries. The result is that intimidation via English libel laws forces authors either to back down or risk losing everything. Peter Wilmshurst, an eminent cardiologist, is currently being sued for libel for questioning the data surrounding a new heart device. If he loses, perhaps on a technicality, he will face bankruptcy.

The week ends back at Imperial College with a lecture. My goal will be to persuade every science student and researcher to sign up to libel reform. This issue affects everyone, but in science it is critical that we can freely criticise ideas. This is not about protecting those writers who are malicious or reckless, as the law should not and will not protect them, but it is about allowing the robust criticism of ideas despite pressure from those with vested interests.

I suspect that I will be preaching to the converted, as Imperial College was home to one of world's great free speech advocates. The college emerged out of the Royal College of Science, and HG Wells established the Royal College of Science Magazine in 1891. He went to become a founder member of PEN, the writers' association, and helped draw up the PEN charter, which includes the statement: "PEN stands for the principle of unhampered transmission of thought within each nation and between all nations; and members pledge themselves to oppose any form of suppression of freedom of expression in their country and community."

My libel case will keep me busy, distracted and mildly depressed for the next two years, but I hope that my spirits will be lifted by the notion that the campaign for libel reform may succeed. If tens of thousands sign the petition for libel reform (www.libelreform.org), then maybe Wells's vision of free speech will find a home not just in America, Europe and the rest of the free world, but also in England.

The Singh CV

The Life

Born in Wellington, Somerset, 1964. Educated at Wellington School, Imperial College, London, and Emmanuel College, Cambridge. Appointed MBE in 2003. Lives in London with his wife, Anita Anand.

The Work

TV director and producer, 1990-1997 (Tomorrow's World, Horizon), then full-time writer. Author of Fermat's Last Theorem, The Code Book, Trick or Treatment? and Big Bang. Also broadcaster and lecturer. This week featuring in Nine Lessons and Carols for Godless People at London venues. the Bloomsbury Theatre and Hammersmith Apollo.