Jeremy Corbyn has been accused of hypocrisy after he demanded small businesses publish details of their gender pay gap but refused to do so for his own team.

It came as a senior Labour source claimed to have seen documents showing a significant pay gap in the leader's office of 25 to 30 per cent between men and women in equivalent jobs.

At the launch of his leadership campaign on Thursday the Labour leader said he was "calling time on discrimination" and committed to requiring all employers to publish details of pay and hours of their staff.