Meryl Streep Likely To Portray Margaret Thatcher As Depressed, Dementia-Ridden

Cameron McCracken, the managing director of the film-maker Pathe, told the Telegraph that Thatcher's health won't be glossed over, but that it will be “treated with appropriate sensitivity." The film will be fictional, but "fair and accurate.” 

You can create whatever reality you want with that kind of statement.