Don't talk to me about what's happened since [Nelson] Mandela! His successor was absolutely hopeless - "no such thing as AIDS" - and this present President... It's a tragedy, you know, what's happened there post-Mandela, because he was an iconic figure.

The concept there was that the small number of developed countries within the Commonwealth should provide assistance. This was not just financial but personal, providing experts and so on, to assist less developed members of the Commonwealth to get on the growing path. And that was part of what we did with South Africa.

It was a remarkable relationship. Margaret [Thatcher] and I had a love/hate relationship. She was always defending the South African regime and we had some terrible fights, including an enormous one in Canada.

I wrote a letter to our Australian newspaper about three weeks before the invasion and I said, "Osama bin Laden must be on his knees morning and night praying to Allah that the Americans will invade." And, of course, he was, because nothing more advanced his cause - the cause of terrorism - than the invasion of Iraq. It was an absurdity.

[John Howard] led the Government. They had the numbers, and just basically automatically went along with the Americans.

The essence of power is the knowledge that what you do is going to have an effect not just an immediate but perhaps a lifelong effect on the happiness and wellbeing of millions of people and so I think the essence of power is to be conscious of what it can mean for others.

If you've got good chemistry at the top, it's an enormous help. It's easy to have good chemistry with some, not so easy with others. With [Robert Mugabe], for example.