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Stephen Sackur speaks to American film-maker and screenwriter Dustin Lance Black.

It's fifty years since homosexuality was decriminalised in Britain. In this period, the campaign for LGBT rights has won landmark victories in many parts of the world - perhaps best symbolised by the normalisation of gay marriage in a host of countries.

Black won an Oscar for the film Milk and has just completed a major series on the struggle for gay rights. Has the time come to declare a famous victory?