A public dialogue is as good as the information upon which it is conducted. So much is self-evident, but observing this mantra is a bit more difficult in the context of controversial consultations.

Take last week’s launch of the Heathrow expansion consultation. It is full of technical information, interpretations and analyses thereof. Battle lines have already been drawn, and the Government has, quite skilfully manoeuvred itself into a position where it has all but made up its mind, and has structured the consultation questions to challenge opponents to explain why and where they disagree. It’s not the most open form of consultation but at least it should ensure a reasonable public debate.