If the half shekel one gives before Purim needs to be Male what do they use in England if all the coins have a picture of the Queen? Are there any with Kings or Princes on them?
In England, the national anthem is "G-d save the Queen". If you spend a half shekel that has The Queen's face on it, how can you "save" the Queen?
There are several ways to circumvent the problem. One way is to give a U.S. dollar (all males on all the bills, for now. That may change pretty soon, BTW!) Or, you can donate the coins after Purim.
If you ask me, I believe the British pound is worth more than U.S. currency. If you really have trouble fulfilling the half shekel mitzvah, you can use for matanot L'evyonim by sending your half shekel to a poor American like me :-)