Prime Minister David Cameron, his wife and their children will not benefit in the future from any offshore funds or trusts, a spokesman said on Wednesday as the British leader faced more questions over family tax affairs.

Cameron's late father, Ian, was among the tens of thousands of people named in leaked documents from Panama law firm Mossack Fonseca that showed how the world's rich and powerful are able to stash their wealth and avoid taxes.

After having at first described it as a private matter, Cameron's office said on Tuesday that he and his family did not benefit from any such funds at present. Cameron also said he did not own any shares or have any offshore funds.