Aberdeen, Scotland - With one of the world's most famous railway lines, Stockton-on-Tees has already given birth to one transport revolution. On September 27, 1825, it carried the first ever passenger rail service along its 40km route through industrial north-east England - changing the world forever.

Today, it is at the centre of another technological breakthrough that some scientists and engineers believe could be just as significant as steam locomotion.

A small company working in two converted shipping containers says it has found a way to make petrol from fresh air and water.