Mozart's opera, Cosi fan tutte, is being performed by the English National Opera in London in the absence of its director.
Abbas Kiarostami, the renowned Iranian film maker, was not allowed into the country to oversee his work. Kiarostami was supposed to come to London for Cosi's rehearsals and premiere.
But he gave up trying to apply for a visa, because he said he had to go through such a Kafkaesque process.
The British ambassador in Tehran tried to intervene, but it was all too late as the BBC's Maryam Erfan reports.