Runaway Heathrow?

In the news today the UK government has decided that a third runway for Heathrow is the best option for the UK to continue competing globally, especially after the EU referendum.
This has been debated for years in the UK, the current Prime Minister herself was against the proposal before her elevation to the hot seat.
If you're interested take a look at the video which shows current air traffic patterns over the UK, is there really room for more planes?
If you're keen to know even more about the project then check out the links I will be putting into Pinterest.

Heathrow Expansion Links

Personally I think the UK is making a mistake with this decision, the impact will be too great environmentally and socially with any benefits reaching too few of the population.  What do you think?