Remember with the exception of BA's JFK they are all into large hubs for onward travel. ( I'm going to ignore PIA as it's a market unto itself at the bottom end )
Also because London is such a mega hub, it makes life difficult for anyone trying to hub at Manchester.
The Munich and Frankfurt hubs are not only further apart but have large population centres of their own and are more equally balanced as cities in their own right. London is let's face it the capital of the world and so distorts things a little. Incidentally, I myself am Scottish so not a southern softy
