Former US President George W Bush has admitted that he committed many errors involving the Iraq war and said he "felt like the captain of a sinking ship" towards the end of his presidency when dealing with recession, according to his new book.

In his book, Decision Points, to be released next week, Bush writes of the errors involving the Iraq campaign and the failure to find the weapons of mass destruction (WMD), despite a number of US intelligence reports pointing to their existence there.