The first thing to say is that the ordinary criminal law in this country, the Human Rights Act, the Children's Act, all of the laws of the country take precedence, but what I'm also saying is that within the context of a secular country, which Britain now kind of is, or at least a country which purports to be relatively equal between religions, there should be some scope for allowing faith communities to govern themselves - subject to it being consensual and subject to everyone's human rights being observed.

I didn't quite know whether I was writing for the non-Muslim or the Muslim, and at the end of the day I'm writing, I hope, for people who are interested, whatever their faith. Even if they don't have any faith. As a barrister I had certain advantages - I could think like a lawyer and I knew how all the laws were fitted together and all the rest of it. One of the things I realized pretty early on while I was writing book about Shari'a was that that was as much a hinderance as it was a help because the Shari'a isn't just a system of rules.

Whenever one writes a book one should have a notional reader in mind.

I spoke to my father - my father's from Pakistan and he's also a lawyer - I said to him, "Well what does the Shari'a say?" And he said, "Well, of course it doesn't justify suicide bombs," but he didn't seem to know where the Shari'a came from or what it was all about. The more I asked people in my family as well as friends, the more I realized that there seemed to be widespread ignorance in the Muslim community. And that's something which I actually found to be the case over the next two and a half, three years I spent writing the book.

The politicized version of Shia Islam that we see in the Islamic Republic post-1979 clearly is very conservative, but, there are other things one could say about Ayatollah Khomeini's concept of a Shia state because that in itself is a blasphemy as far as most Shia clerics are concerned. There's a theory that he developed in the early 1960s in the town of Najaf talking about - well not liberalism, necessarily, but flexibility though.

Shari'a is not just the Qur'an, you see Shari'a is comprised according to all the doctrines. There's consensus and analogy - argument by analogy. These are the four components in the Shari'a. An orthodox Sunni would not accept that the Shari'a was simply comprised of the Qur'an itself and actually there are people who say that it's heretical to believe that. They have to say that because if they don't say that then they would have to accept that, for example, stoning is not a punishment which appears in the Qur'an - it doesn't.

The one fatwa that everyone here is probably familiar with is the Salman Rushdie fatwa, but a fatwa doesn't have to be a violent thing at all. A fatwa is simply a ruling on Islamic law; there can be fatwas on clothing.