Gov't rule out third runway at Heathrow as support grows for Boris Island.

Despite disquiet amongst a number of tory backbenches the Government today ruled out a third runway at Heathrow Airport.

tbg. can also exclusively reveal that had the go-ahead been given for a third runway then Richmond MP Zac Goldsmith would have resigned his seat, forced a by-election and re-stood as an Independent.

Nick Clegg said that it wasn't a case of "sticking our heads in the sand" over the current aviation debate.

However, former President of the National Conservative Convention Charles Barwell told tbg. - "Heathrow is a tired airport in the wrong place strangling west London and snarling up the road network."

"The bold best option is not a third runway at Heathrow but rather a four runway 'Boris Island' in the Thames Estuary linked to HS1 and partially funded by the sale of Heathrow for development."

+UPDATE: 22:44+

Rumour doing the rounds tonight that Transport Secretary Justine Greening threatened to resign too.