What on earth are you talking about now?
Trickledown is not about the owners of LHR giving handouts to the poor people of the north east. It is about businesses in the NE being able to get a flight from Newcastle or Durham to China via an easy connecting flight through LHR. It is about foreign companies having an option to open offices and factories outside of the SE of the UK and therefore creating badly needed jobs and bringing wealth to the regions.
The construction alone will bring jobs and money to construction and manufacturing companies all over the UK.