More than 40 high-profile female BBC employees have written an open letter to BBC director-general Tony Hall published today in UK newspapers urging a quick end to gender pay disparities at the pubcaster. It comes after an annual BBC salary report published last week revealed two-thirds of its highest salaries were dished out to men. The letter, signed by the likes of BBC World News America anchor Katty Kay, BBC Newsnight presenter Emily Maitlis and The One Show host Alex…