The news of another Parliamentary report questioning the viability of the Heathrow will make the Government stop and think, just before its expected announcement on what it will do.

The list of conditions that the Environmental Audit Committee want attached to Heathrow, even should it be given the go-ahead, could seriously affect its viability.

Deliverability was always going to be a consideration, particularly as businesses are pushing for more capacity above anything else. The longer the Heathrow project will take to come to fruition, especially when compared with rival projects, the more influence this will have on government thinking.

What also has to be remembered that come May 2016, the new Mayor of London will be anti-Heathrow.