The head of the World Intellectual Property Organisation could face calls for his resignation after an independent investigation found he consistently misled the organisation about his age.

A confidential report by Wipo's internal auditor, seen by the Financial Times, said Kamil Idris, director-general, misstated his age in applying for his first job at the UN agency in 1982, claiming he was born in 1945 rather than, as he now says, 1954.