Oh so now it's the business case that doesn't work?
BAA have the investment, WW is just doing his job and making sure they don't pass the cost onto BA. The portion financed by the tax payer will work as the above.
Clutching at straws springs to mind now, especially bring the VW case into the equation.
I would say the UK population is mostly split between those who want expansion at LHR and those who really don't care. There is a minority who do not want it made up of a mixture of people either worried about their house price, spotters concerned about losing new types from the regionals and those in the north with a huge chip on their shoulder about investment in the nations capital.