Get one of those pre-paid Mastercards with your wife as an additional card holder... DHL it across (£20 via DHL document express).. and pay for the ticket using the card number that is in your wife's name.
We've been using the Virgin one for just this kind of situation. We learned the hard way after my wife was refused boarding by PAL because she could not provide them with a copy of my card and passport. (Like I'd be silly enough to allow that info into free circulation in the Phils!)