Breaking up the Big 4 accountancy firms

The Big Four accountancy firms: Are they in fact more like the Big One? And should they be broken up? Also: the Duke of Westminster's 9 billion tax free inheritance and how his family history forms the legal basis for the justification of tax avoidance around the world; how come the world's biggest banks are now officially endorsing transparency measures? And...so much for Panama cleaning up its act post-Panama Papers scandal: we discuss the demise of Panama's not-so-transparent Transparency Commission.