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LONDON, UNITED KINGDOM - APRIL 9: British Home Secretary Theresa May speaks during the Conservative Party Spring Forum on April 9, 2014 in London, United Kingdom. During the forum, Prime Minister David Cameron admitted that he could have handled the Panama tax row better. (Photo by Kerry Davies - WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - APRIL 9: British Home Secretary Theresa May speaks during the Conservative Party Spring Forum on April 9, 2014 in London, United Kingdom. During the forum, Prime Minister David Cameron admitted that he could have handled the Panama tax row better.  (Photo by Kerry Davies - WPA Pool/Getty Images)