The Charity Commission has launched a statutory inquiry into Oxfam amid concerns it might not have “fully and frankly disclosed” all details about the allegations in Haiti in 2011.

Oxfam's deputy chief executive has quit in the wake of the aid worker sex scandal saying she was 'ashamed' of what had happened.

Penny Lawrence said she took full responsibility for what had happened on her watch and was sorry for the 'harm and distress' it had caused supporters.

Oxfam has faced intense criticism over its handling of sex allegations, including the use of prostitutes by workers in Haiti in 2011.

Ms Lawrence said: "As programme director at the time, I am ashamed that this happened on my watch and I take full responsibility."