The shady world of lobbying

The funding of political parties is only one aspect of the way money can corrupt the political system.

The world of political lobbying is also under scrutiny, after the Adam Werritty affair and the Prime Minister's failure to address what many see as a dubious industry. So which are the companies that boast about their access to the inner sanctums of power? Which former politicians and advisers work for them? And who do they represent?

* See clarification 30 December 2011