Question: Managed by English music manager and producer, John Arnison, Leftfield, a British electronic music group, began as a duo between who?

Context articles: Peter Grant (music manager)
Mr. Saturday Night (album)
Leftfield
White Noise (Disclosure song)
John Coletta
Rod Smallwood
John Arnison
Simon Napier-Bell
Redshift (group)
The Future Sound of London

Peter James "G" Grant (5 April 1935 – 21 November 1995) was an English music manager.
 Grant managed the popular English bands the Yardbirds, Led Zeppelin and Bad Company, among others, and was also a record executive for Swan Song Records.
 Grant has been described as "one of the shrewdest and most ruthless managers in rock history".
 He is widely credited with improving pay and conditions for musicians in dealings with concert promoters.
Mr. Saturday Night is the latest full length studio album from singer-songwriter Julian Velard, released on April 4, 2011 in the UK.
 A US release date has been set for November 1, 2011.
 Distributed through Universal Music Group, the album is set to be released on Planeteer Records, Velard's own label he formed with English music manager Colin Lester.
Leftfield are a British electronic music group formed in 1989.
 It began as the duo of Neil Barnes and Paul Daley (formerly of the Rivals, A Man Called Adam and the Brand New Heavies).
 In January 2010 Barnes resurrected Leftfield without Daley and, after touring for a few years, finished writing new material for a third album entitled "Alternative Light Source".
 Daley declined to be involved and is focusing upon his solo career.
"White Noise" is a song by British electronic music duo Disclosure, featuring vocals from electronic music duo AlunaGeorge.
 It was released as a digital download in the United Kingdom on 1 February 2013.
 The song peaked at number two on the UK Singles Chart.
 The track is the second single from the duo's debut studio album, "Settle" (2013).
 The song was written by Howard Lawrence, Guy Lawrence, Aluna Francis, George Reid and James Napier.
John Coletta (1932 – 9 July 2006) was an English music manager and music producer.
 He managed Deep Purple, Whitesnake, Ritchie Blackmore's Rainbow, Praying Mantis and others.
Roderick Charles "Rod" Smallwood (born 17 February 1950) is an English music manager, best known as the co-manager of the British heavy metal band Iron Maiden.
 With his business partner, Andy Taylor, whom he met while studying at Trinity College, Cambridge, he founded the Sanctuary Records Group in 1979, which became the largest independent record label in the UK and the largest independent music management company in the world until its closure in 2007.
 Prior to managing Iron Maiden, Smallwood managed Steve Harley & Cockney Rebel.
John Arnison is an English music manager and producer.
 Acts he has managed include Marillion in the 1980s and much of the 1990s, Gabrielle, Billy Ocean, Aswad, MN8, Charles & Eddie, Yusuf Islam (formerly Cat Stevens) Leftfield, Connie Talbot and Noisettes.
 2015 John now runs John Arnison Music and Media, a bespoke management company Managing the Singer Billy Ocean and up and coming band CC Smugglers.
Simon Robert Napier-Bell (born 22 April 1939) is an English music manager, author and journalist.
 At different times, he has managed artists as diverse as the Yardbirds, John's Children, Marc Bolan, Japan, London, Ultravox, Boney M, Sinitta, Wham!
, Blue Mercedes, Alsou and Candi Staton, among others.
Redshift is a British electronic music group, founded in 1996 by Mark Shreeve.
 Their musical style is rooted in the early to mid 1970’s German electronic music era, often described as Berlin School, and transcends the genre using musical originality, multi-instrumentation, and complex harmonic arrangements using analogue sequencing.
 Their pieces are described as both exciting and haunting in equal measure, expressing strong central themes, and include contrasting atmospheres of rich sonic textures.
 Redshift music has been played on BBC TV and some listeners have likened certain pieces to film score, neo-industrial, as well as dark ambient.
 Listeners have commented on the hypnotic quality of the musical compositions.
The Future Sound of London (often abbreviated to FSOL) is a British electronic music group composed of Garry Cobain (sometimes stylised as "Gaz" Cobain) and Brian Dougans.
 The duo are often credited with pushing the boundaries of electronic music experimentation and of pioneering a new era of dance music.
 Although often associated with ambient music, Cobain and Dougans usually resist being typecast into any one particular genre.
 Their work covers many areas of electronic music, such as ambient techno, house music, trip hop, ambient dub, acid techno.
 In addition to music composition, their interests have covered a number of areas including film and video, 2D and 3D computer graphics, animation in making almost all their own videos for their singles, radio broadcasting and creating their own electronic devices for sound making.
 They have released works under numerous aliases.