We can't really judge passenger number forecasts for a single runway BHX by looking at what LGW is proposing. It's practically banned anything under 120 seats by imposing levies on the smaller aircraft that BHX and all other regionals need to build up a network of routes, and I imagine over time the levies will be for anything under 150 seats. Throw in it being "London" and the skewed advertising campaigns by national bodies that for the most part ignore anything that's not within the confines of the M25 means getting tourism spend away from London becomes a difficult job. May be the likes of Birmingham, Liverpool, Leeds and Manchester properly join forces in marketing "the Real England" for both investment opportunities and tourism.