Aer Ryan - sorry but Gatwick will not get a second runway or Heathrow a third, they will not be given the go-ahead especially in the present political climate. If the SNP hold the balance of power - more than likely - or even the Lib Dems -after the general election I do not think building a third runway in the south east of England will be one of their main priorities. I was around when Gatwick opened in the 1950s and some 60 years later it is still not operating to full capacity.
Plus I also believe ´´Boris Island´´ is a non-starter.