A new documentary recalls the unmatched rivalry between Chris Evert and Martina Navratilova, but it is also an honest and intimate look at their unlikely off-court friendship and shared battle with cancer, writes LINDA PENTZ GUNTER

On January 2 2014, PJ Harvey used her turn as guest editor of the Today programme to expose the realities of war, arms dealing and media complicity. The fury that followed showed how rare – and how threatening – such honesty is within Britain’s most Establishment broadcaster, says IAN SINCLAIR