Had a pint with my dad's mate at lunchtime today. He runs an engineering firm, and made the point that Teesside's engineering and chemical industries have no need to be whisked to the docklands. Their business is in the M4 corridor, or elsewhere round the world. In other words, they need a Heathrow link either for close access to the south west, or for onward connections. Flights to the docklands just adds travel time to their journey.