A university lecturer has produced a taxi-type vehicle called Microcab - and its only emission is water vapour.

The vehicle can hold a driver and three passengers, has a maximum speed of 30mph and does around 150 miles to the gallon of hydrogen.

John Jostins, a senior lecturer in design and digital media at Coventry University, has been working on the ultra-light taxi-type vehicle for eight years.

He said: "My passion is developing alternative fuels to reduce noise pollution and improve air quality in cities.

"Microcab is completely silent and its only emission is water vapour. It could be the answer to the environmental and cost problems associated with oil."

Mr Jostins hopes within the next three years a handful of pilot schemes around the country to help will help to refine the design.

It will be on show at the awareness-raising Fuel Cells in Action exhibition on Monday, October 3, in Trafalgar Square.