^^ I'm going to include other metro area stadia in future updates - I thought that I might as well! Some of the greatest growth is in the metro area surrounding London, eg Milton Keynes' new 30,000 stadium, Brighton's new 22,000 stadium and Portsmouth's Fratton Park (will be turned an entire 90 degrees to allow for expansion possibly up to 35,000), and many more which I will get into detail about. The most amazing though will have to be Milton Keynes' new stadium which is suprising considering their position as they are currently ranked 68th of all the English football teams at this very moment and to make matters worse are last of England's third league meaning they could be relegated to the 4 league!
Milton Keynes Stadium (MK Dons): 30,000 (+ 5,000 indoor arena)
Falmer Stadium (Brighton & Hove Albion): 22,000
New Fratton Park Stadium (Portsmouth FC): 28,000 > 35,000 (currently 20,220)
I'm unsure about Earls Court Station as its kind of seperated from the actual event halls, but there would have to be transport improvements as it is as its already very busy any day or time of the week. I doubt they'll knock it down though - its older than most cities termini are!