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Richard Murphy's tireless blogging has brought him this far and undoubtedly has helped to bring the issue of international tax avoidance and evasion to the attention and now the agenda of the G20 governments.

Now that all the G20 have agreed on the principle of tax information exchange between countries we will all need to put our thinking caps on to devise and develop systems that will be able to send and receive information on taxpayers across borders. For example, do we know which agencies will be handling the data requests? Will they be banks and tax collection agencies? Will the requests be made by email, on forms or by telephone? There's a lot to consider before their promises can be turned into real action.