It's oft been said that Team Eng-er-land cannot practise their penalties because "they cannot create the pressure of taking them for real".
It's also a well known fact that bored and pampered footballers love to gamble and with money falling out of their arses, they like to play for higher stakes.
I think I may have a solution. Combine the two.
Introduce a betting culture to taking penalties and let the stakes become more outrageous as the penalties go into sudden death. Make sure every team squad member takes spot kicks (including the goalie) and let them at it- winner takes all.
No more excuses about the lack of pressure and no more whinging on about being bored. Simple, just like your average player.