Rapper Dave has won the Mercury Prize for his debut album, Psychodrama.

A thought-provoking reflection on his upbringing in London, it has been hailed as "the boldest and best British rap album in a generation".

The Streatham-born star beat the likes of Foals, Anna Calvi and The 1975 to win the prize, which recognises the best British album of the last year.

Released in March, Psychodrama entered the UK charts at number one and has sold 129,354, copies to date.

Mercury Prize judge Annie Mac said the album "showed remarkable levels of musicianship" as well as "true artistry, courage and honesty".

"I did not expect this," said Dave, whose full name is David Orobosa Omoregie, as he took to the stage.

He went on to dedicate the award to his family and friends, especially his brother, Christopher, who is serving a life sentence for murder.

Psychodrama was inspired by the therapy Christopher is receiving in prison, in which offenders role-play events from their past to help with rehabilitation; and finds the 21-year-old casting an eye over his own life to see what lessons he can learn.

Its lead single, Black, focused on the perception of black people in Britain.

"Black is pain, black is joy, black is evident," Dave rapped. "It's working twice as hard as the people you know you're better than."

When it was played on BBC Radio 1, the song provoked complaints from a small minority of listeners who said it was "racist against white people".

Annie Mac spoke in defence of the song, saying: "If you are genuinely offended by the idea of a man talking about the colour of his skin and how it has shaped his identity, then that is a problem for you."