We were first introduced to The Black Panther, AKA T-Challa (Chadwick Boseman) in Captain America: Civil War, fighting for team Stark.
Croydon Guardian:

T'Challa

We left T’Challa as he returned to Africa to serve his country as the new leader of the nation of Wakanda, following the death of his Father. T’Challa withdrew to his technologically advanced retreat and discovers that there is a challenger for the throne.

Two foes conspire to destroy Wakanda and only T’Challa’s alter-ego The Black Panther can save Wakanda from being dragged into a world war.
Croydon Guardian:

Black Panther

However, I’m afraid that you will have to wait until 12th February 2018 until the film is released in the UK.

Check out the latest trailer: