I can't see what the problem is.
Most British girls like a man to hold off a little. Wading in all guns blazing (as you guys over the pond generally like to do) I suspect would be a turn off for her, plus given the state you were clearly in, your performance may have been a little under par anyway?
Pick up the phone and ask her out to dinner, and keep doing what you're doing, would be my advice.
Mind you I'm the last person you should ask!
Good luck!
A