During a speech to the UK Parliament, ‘Luther’ actor Idris Elba highlights the lack of diversity in British television and explains why this needs to change.

“What all this taught me, is too often people get locked inside boxes,” he said.  “And it’s not a great place to be. Ask women, they’ll say the same thing. Or disabled people. Or gay people. Or any number of under-represented groups.

“So today I’m asking the TV & film industry to think outside the box, and to get outside the box. This isn’t a speech about race, this is a speech about imagination. Diversity of thought.”

Afterwards, Elba said on Twitter that addressing the Parliament was “the most important speech” that he has ever made.

Parliament????THE most important speech I’ve ever made, no other time has made me realise the torch I hold. @Oona_King pic.twitter.com/JoIFrvAjDE

— Idris Elba (@idriselba) January 18, 2016

Watch a clip from his speech below, or read the full transcript on Deadline.