In April's Taxcast: Amazon's tax affairs, the global tax cut race to the  bottom, India tackles tax havens and the miners in Zambia who pay more tax than the multi-national mining company.

In March's Taxcast: Apple i-tax dodging, reclaiming Arab Spring country assets, the rich country club of the OECD and the ABCs of setting up letterbox companies. It's child's play!

In February's Taxcast: Are City of London Police really serious about prosecuting financial crimes? Are bankers paying fair taxes on their bonuses? And how Facebook is saving billions in tax via Ireland and Bermuda.

Special focus this month: the tax haven of the City of London, semi-autonmous state within a state.

Taxcast content this month: We discuss the implications of the Vodafone vs India landmark tax case, compare Bill Gates and Mitt Romney's attitudes to taxation and visit the Occupy camp outside St Paul's Cathedral in London.