Heather Bellamy spoke with Amanda Jackson from Micah Challenge

Heather: Can you give us some examples of the people that this letter is from?

Amanda: Yes, the head of the World Evangelical Alliance Geoff Tunnicliffe; the head of the World Council of Churches; the head of the world Pentecostal Fellowship, who's based in Malaysia; we've got the head of the Church of God; we've got the Methodists; Anglicans; bishops from Tanzania and South Africa, we've got the Archbishop of Southern Africa; and so a whole range of leaders from many different backgrounds and churches. We've got some business people as well: Graham Power, who heads up Global Day of Prayer and is a business person who's very keen for business to be ethical, he signed on as well; Jim Wallis; so a whole raft of different people.

Heather: You mentioned that Australia holds the presidency of the G20 this year. How do you expect them to respond to the issues you've raised?

Amanda: They have already responded. We're in talks with officials in Australia on a regular basis. It's wonderful that Christians can take that message of the letter - from Christians all around the world - and then they can go and actually sit down with finance officials in Australia! It's fantastic to have that access.

There is a great keenness in Australia to do something about tax evasion; to do something about declaring who's getting the profits from companies. One of the things that is secret is that in many companies they hide who are the actual beneficiaries of their profits. If it's hidden then of course you don't have to pay taxes, so what it's called is BEPS. It's revealing who is actually the beneficial owner of the profits of a company. There's going to be steps taken to really crack down on that, which is great.

There's going to be real steps for governments to share information with each other as well, so that people don't end up paying more tax or unfair tax: they just end up paying a fair amount of tax wherever they're based in the world and wherever they're making their income.

You know that when Google and Amazon got into trouble here about the fact that they pay so little tax, it's because they conduct their business here. We provide the education for their workers, the infrastructure and the roads and all that sort of thing, but they're not actually contributing towards the provision of those services. And we think it's really important for Christians to say: "We want a just world where people's work is rewarded fairly, where businesses are contributing fairly and where governments are acting with integrity."

Heather: How important do you think the global nature of this campaign is to the potential success of what your aims are?

Amanda: That's a good question. I think it's really important because the G20 is a group of the 19 biggest nations in the world. And lots of little nations have said, "We don't count in those decisions," but in fact it's really wonderful that over 180 countries around the world have been involved in this campaign - and some of them are tiny countries, with a population of seven million and they would never have thought that they could have an impact on global decision-making.

The truth of the matter is we do live in a global world and those companies want to operate in some small nations around the world because they have resources. And so we do need, more than ever, for every nation to be involved in decision-making: you can't just let one or two huge players dominate everything and feel they can get away with everything.

It's wonderful to think that Christians all around the world are praying: they're praying for those leaders to make fair and good decisions. It's great that we as a campaign can say it's not just rich countries in the world that care about these issues: it's Christians in many places around the world who are affected by corruption every day of their lives and they want it to end and they're crying out for justice.

If people want to find out more they can go to our website www.exposedcampaign.com where you can find lots of information and stories about what Christians are doing and how they're bringing hope.