There is the option of using National Express. Goes direct from Southampton to Wembley. Bus leaves one hour after final whistle (irrespective of whether normal time/extra time/pens).
How about the old Pop Will Eat Itself song for Italia 90 - Cicciolina
"Gabbiadini, Gabbiadini, Manolo Gabbiadini,
Gabbiadini, Gabbiadini for I-talia, I-TALIA"