The decision about where to expand is one which no-one can see a clear way through. If London still had pea-soupers then this is the political equivalent.

Other cities that have made a decision have done so because businesses, and others, have come behind a preferred solution. This has not been the case so far here.

This needs to happen once Davies reports. Without that concerted pressure and advocacy, government will continue to delay a decision especially with the London mayoral election fast approaching.

Britain has avoided airport decisions before, it can do so again.