Thandie Newton has said that she cannot get parts in Britain because there are no roles for black actors in period dramas like Downton Abbey and Call the Midwife.

Newton, 44, has recently been seen on screen in HBO's gritty science fiction thriller, Westworld, and has landed a film role in the as-yet untitled spin-off about Star Wars character Han Solo.

The London-born actress will make her debut in BBC One crime drama Line Of Duty when it returns next Sunday.