In May, Liberal Democrat shadow transport secretary Norman Baker challenged environment secretary Hilary Benn on the issue in the Commons. Benn said:
We do, indeed, need to look at how we phase in the new rules, but I assure the hon. Gentleman that that is not to do with any decisions that might be taken in the future about airport capacity.On the face of it, it's a pretty obvious untruth. But then just about all the facts on Heathrow expansion are being fixed around the policy.