A former managing director of the Post Office has told a public inquiry he did not realise for more than three years that he was the head of a prosecuting authority.Alan Cook said he had not heard anything "sufficiently categoric" to suggest that the Post Office made prosecutorial decisions and said he blamed himself for "not picking up on it".

A former managing director of the Post Office has told a public inquiry he did not realise for more than three years that he was the head of a prosecuting authority.Alan Cook said he had not heard anything "sufficiently categoric" to suggest that the Post Office made prosecutorial decisions and said he blamed himself for "not picking up on it".