Isle of Grain airport plans could be thrown off course

A plan backed by Boris Johnson to replace Heathrow and move the airport east could be thrown off course. A £3 billion flaw has emerged in the Mayor's ambition to build an estuary airport on the Isle of Grain.

The site is currently used to supply a fifth of Britain's energy needs and moving that elsewhere would come with a huge price tag

ITV London Political Correspondent, Simon Harris reports: