When George Bush Senior [George HW Bush] was getting his alliance together to go into Iraq - to kick the Iraqis out of Kuwait - he rang me up. I was very close to George Bush Senior; I got to know him well as Vice President to Ronald Reagan. And George rang me up and said, "Oh, Bob," he said, "I'm having trouble with Brian [Mulroney]." He said, "He's got a big wheat trade with Iraq, and he doesn't want to upset that." I said, "You leave it with me."

I rang my friend Jim Wolfensohn, who was then running a private commercial bank in New York. I said, "Come up to Vancouver", and he did. I put my proposition to him. He said, "I think it could work." I said, "Will you help us?" He said, "Yes." So, I set aside senior people in our treasury and they worked with Wolfensohn and the investment sanctions were applied. And that's what brought the regime down. The last South African Finance Minister, Barend du Plessis, went on record as saying that it was the investment sanctions that put the final nail in the coffin of apartheid.

We [ with Brian Mulroney and Rajiv Gandhi] went to the meeting in Canada [the 1987 Vancouver CHOGM] and I said to them there that sanctions weren't working; they were just being busted. And it did seem to me that one way that we could bring the apartheid regime down would be if we did mount an effective investment sanction.

It was very much an Australian/New Zealand initiative to have a nuclear free South Pacific. And the Americans were very apprehensive about this. So, I explained to them that, as far as I was concerned, this didn't involve any diminution in our commitment to the ANZUS relationship. But David Lange took it further and he barred visits of US nuclear warships to New Zealand.

In fact, soon after that [South African sanctions], I was going on an official visit to the UK and Margaret Thatcher instructed every minister to clear the decks of any outstanding matters between us - Australia and the Brits. And she went out of her way to make sure that that was as successful a visit as it possibly could be.

It had things that it could do and which I thought were worthwhile: one would be South Africa, of course. And, as I said, I assumed a leadership role within the Commonwealth on that.

I went along with it, and wanted to appoint a significant figure in Malcolm Fraser. I didn't have high hopes that they'd be able to do anything, but something was worth a try.