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Is the dream of hydrogen as a clean fuel of the future still alive? Lesley Curwen goes for a trip on a hydrogen-powered London bus and talks to Ali de Napoli of Transport for London about the costs and benefits of using hydrogen.

Veteran US scientist Professor Jerry Woodall of Woodall Tech describes his plans for a 'table-top micro-reactor' using aluminium to make hydrogen locally wherever it's needed.

But Dr Christoph Frei, Secretary-General of the World Energy Council, warns that hydrogen may play only a small part in the energy mix of the future.

Plus, US personal finance expert Ramit Sethi urges people not to delay saving for retirement.