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The Government is currently deciding what to do with the UK's civilian plutonium stockpile - the largest in the world. Some are concerned that it could become the target of terrorists intent on making a dirty bomb.The stockpile has come from nuclear waste that was reprocessed to extract plutonium which was to have been used to power a new generation of fast breeder reactors. But that project failed to be finished and now just over 100 tonnes of it is being stored at Sellafield in Cumbria. The stockpile grew even more when the UK received imports from Japan and Germany which it had hoped to convert into fuel - again this project has failed to deliver.The Government is considering a number of options.Convert the plutonium into mixed oxide (Mox) fuel and then burn the fuel in conventional, nuclear reactors. This would involve the construction of a second Mox fuel plant at Sellafield despite the fact the first plant failed to produce any significant amount of Mox and was closed in 2011.Burn the plutonium in a new breed of Prism fast reactors. But critics say the technology is not proven and therefore risky.Treat it as a deadly waste product and bury the plutonium currently stored at Sellafield deep underground for thousands of years. Again critics say burying waste is risky and even then the plutonium would have to be treated before it could go into the facility. Supporters of plutonium as fuel still claim that would be throwing away a potentially valuable asset. On top of that we are not likely to have a repository for decades and very few local authorities have volunteered to consider having it in their back yard.Rob Broomby investigates the difficult questions facing the Government whose decision will potentially bring in a bill for the taxpayer of billions of pounds. And how much of gamble will it be choosing what to do with this most deadly of substances?Producer: Ian Muir-Cochrane.

21 years after the signing of the Maastricht Treaty, Britain is trying to cut the cost of the European Union.As the institution comes of age, Gerry Northam asks whether the EU's spending on itself has become excessive and - if so - whether member states do anything about it.In Brussels, hundreds of millions of pounds have been found for projects described by Eurosceptics as "self-aggrandisement". An art deco showpiece is being transformed into a new headquarters for the European Council at a cost of around 300 million Euros (£250m). A further 55 million Euros (£46m) is going to create a House of European History - a museum celebrating European integration. A new 20 million Euros (£17m) visitors' centre at the European Parliament, called the Parlamentarium, has been dismissed as a multimedia tribute to itself.Meanwhile alarm has been raised that money the United Kingdom designates as aid for developing countries is being diverted by Europe to encourage Turkey, Serbia and others to join the Union. MPs claim this money directly disadvantages Britain.Critics say Europe's expansion comes with an unnecessarily large price tag. Are they right?Reporter: Gerry Northam Producer: Chris Doidge.

Surrey police are probing the mystery death of a Russian exile who was helping to locate millions of dollars missing from the Russian treasury. City experts claim London is one of the routes for those laundering the proceeds of Russian crime. Britain is also now a destination of choice for many wealthy Russians. But how much do we know about some of those who choose to settle here? Internationally, there's tension between Washington and Moscow over the Magnitsky Act, in which the US introduced new sanctions for Russian officials suspected of corruption, freezing their assets and barring their entry to America. Prominent MPs are arguing for similar measures here. So is Britain too lax in cases where suspicions are raised? Reporter: Julian O'Halloran Producer: David Lewis.