David Brett is an English

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 actor

Actor

An actor is a person who acts in a dramatic production and who works in film, television, theatre, or radio in that capacity...

, singer and arranger

Arranger

In investment banking, an arranger is a provider of funds in the syndication of a debt. They are entitled to syndicate the loan or bond issue, and may be referred to as the "lead underwriter". This is because this entity bears the risk of being able to sell the underlying securities/debt or the...

.
He was one of the original members of The Flying Pickets

The Flying Pickets

The Flying Pickets are a British a cappella vocal group, who had a Christmas number one hit in 1983 in the UK Singles Chart with their cover of Yazoo's track "Only You".-History:...

, and arranged a number of the group's songs, including the number one hit Only You

Only You (Yazoo song)

-Track listing:7": Mute/7 MUTE 20 # "Only You" - 3:10# "Situation" - 3:447": Sire/9 2-98447 # "Only You" - 3:10# "Winter Kills" - 4:0112": Mute/12 MUTE 20 # "Only You" - 3:10# "Situation" - 5:20CD: Mute/CD MUTE 20...

.
His work as an actor, mainly on stage, has included Lark Rise to Candleford

Lark Rise to Candleford

Lark Rise to Candleford is a trilogy of semi-autobiographical novels about the countryside of north-east Oxfordshire and Buckinghamshire, England, at the end of the 19th century. They were written by Flora Thompson and first published together in 1945...

at the Finborough Theatre

Finborough Theatre

The Finborough Theatre is a fifty seat theatre in the Earls Court area of London, United Kingdom , which presents new British writing, UK and premieres of new plays, primarily from the English speaking world including North America, Canada, Scotland and Ireland, music theatre, and rarely seen...

, London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, but he has also participated in a number of TV productions and played Dedalus Diggle in Harry Potter and the Philosopher's Stone

Harry Potter and the Philosopher's Stone

Harry Potter and the Philosopher's Stone is the first novel in the Harry Potter series written by J. K. Rowling and featuring Harry Potter, a young wizard...

.

In 1976 Brett worked for the Mikron Theatre Company and was one of the writers of the play "Puddle It!", the story of the people who built the canals 1761-1827. He also collaborated in writing some of the music and lyrics for the show, along with Antony Burton, John Saxon, Mark Steeves and Ruth Tansey.
In the same year, the Mikron Theatre Company also took the play "Up The Cut" on the national waterways tour, in which he also performed .

In 1980 he appeared in the stage production of The Hitchhiker's Guide to the Galaxy at the Rainbow Theatre as Ford Prefect; although not critically acclaimed, this show was well received by HHGTTG aficionados.

Brett is the first of two actors from the Mikron Theatre Company to appear in a Harry Potter film, the other being Mark Williams

Mark Williams (actor)

Mark Williams is an English actor, comedian, screenwriter and presenter. He is best known as one of the stars of the popular BBC sketch show The Fast Show, as well as for his role as Arthur Weasley in the Harry Potter films....

 who appears as Arthur Weasley.