Reviewed by GREG KING Director: Mike Leigh Stars: Rory Kinnear, Maxine Peake, David Moorst, Pearce Quigley, Robert Wilfort, Karl Johnson, Alistair Mackenzie. Set in Manchester in 1819, after the Napoleonic Wars, this epic film tells of the infamous Peterloo massacre, a shameful but defining moment in British history about which little is known. A massed crowd of some 60,000 people who had gathered in …