Designed by Herefordshire-based Hugo Spowers, just two prototypes of the car currently exist, one of which is at the London Science Museum.

BBC: Hugo Spowers with hydrogen-powered car

"We have to develop the entrepreneurial spirit in the country, " Brown said in a speech at the London Science Museum, where he was announcing the new policies.

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Manufacturer Brother, which says it has made 5.9 million typewriters since its factory in Wrexham opened in 1985, has donated the last machine to London's Science Museum.

BBC: UK's 'last typewriter' produced

The project was launched at the Science Museum, London, as part of Climate Week.

BBC: Fun and games 'can save the planet'

There's an interactive orchestra, live videos from around the world, and a real robot that will draw your portrait in sand at the Science Museum in London.

CNN: Hidden gems of the Webby Award nominees

But Clarke seems as popular as ever with his public - a recent exhibition aout him at Science Museum in London was extended from three to 18 months by popular demand.

BBC: Legendary science fiction writer Arthur C Clarke at 80