Expensive to us in our daily life, but in the context of the total investment at stake - it's peanuts - a new airport in the Thames was recently priced at nearly £50Bn (I'd expect double myself with the extras), expansion at Heathrow is tabbed at £15Bn IIRC - With the Airports Commission costs at £8m IIRC. The outcome is a recommendation of direction, the report doesn't bypass the planing processes that will still be required, which are subject to being called in by the Sec of State, which can have judicial reviews, challenged in parliament, taken to the high court, the Supreme Court then probably the European courts - regardless of the recommendation, there's a long way to go yet and could all change when the Tories have a new leader in circa 2019 - potentially Boris !
You missed a bit... otherwise spot on!