Fahrenheit 9/11, the 2004 screed against George W Bush, remains the highest-grossing documentary of all time. But many argued that despite its box-office numbers it had little effect in changing hearts and minds going into the US presidential election that year: it may have been preaching to the converted.

Now, with a reversal of the dates – 9 November was when Donald Trump was declared the winner of the 2016 presidential election – Moore is back. The premiere of Fahrenheit 11/9 took place at the Toronto International Film Festival, and Moore himself gave out red scarves, to signify revolution, to everyone in attendance.

But is the film any good? Click the play button above to start the video and hear critic Caryn James’s verdict.

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