Present Line-up:

• Tim Smith - lead vocals, guitar, keyboards.
• Jim Smith - bass, backing vocals.
• Kavus Torabi - guitar, backing vocals.
• Bob Leith - drums, backing vocals

Member past and present:

• Ralph Cade aka Raphel Cadd - saxophone?(1978-1979)
• Mark Cawthra aka Little Bobby Shattocks (1979-?)
• William D. Drake - keyboards(1983-1990)(after Bill left it was decided not to replace him and at all subsequent gigs the keyboard parts have been pre-recorded)
• Sharron Fortnam (née Saddington) vocals (appears whenever "Will Bleed Amen" is performed)
• Christian Hayes aka Bic - guitar, vocals(1989-1990)
• Marguerite Johnson - saxophone (left 1983)
• Dominic Luckman - drums (1983-1994)
• Colvin Mayers aka Max Cat (1978-?)
• Jon Poole - guitar, keyboards, vocals (1991-2004)
• Bob Leith - drums (1994-present)
• Michael Pugh aka Peter Boker - vocals (1977-?)
• Tim Quy - percussion (1980-1990) (who is not dead, despite the ominous dedication at the end of the Mare's Nest video - "Dedicated to Tim Quy, who left our world 30/6/90". This was simply the date of his last show with Cardiacs, not his last day on earth. Tim Quy is alive and well.)
• Graham Simmonds - guitar (left 1983)
• Tim Smith aka Philip Pilf - lead vocals, guitar, keyboards (1977-present)
• Jim Smith aka Patty Pilf - bass, vocals (1977-present)
• Sarah Smith (née Sarah Cutts, now Sarah Jones) - saxophone (1980-1989)
• Peter Tagg aka Mr Richard Targett - drums (1977-1979)
• Kavus Torabi - guitar, vocals (2003-present)

Musical relations:

• Ad Nauseum (Jon Poole and Bob Leith – prior to joining Cardiacs)
• Katherine in a Cupboard (Bob Leith, Jim Smith)
• Dark Star (Christian Hayes - after leaving Cardiacs and Levitation)
• The Goddamn Whores (Jon Poole - after leaving Cardiacs) 
• Lake of Puppies (Bill Drake - after leaving Cardiacs)
• Levitation (Christian Hayes - after leaving Cardiacs)
• Mice (Dominic Luckman and Christian Hayes - after leaving Cardiacs)
• Mikrokosmos (Christian Hayes solo project)
• The Monsoon Bassoon (Kavus Torabi - prior to joining Cardiacs)
• Mr and Mrs Smith and Mr Drake (Tim Smith, Sarah Smith, and Bill Drake)
• Panixphere Mk1 1982-1984(Christian Hayes, Little Hicky (become Cardiacs roadie))
• Panixphere Mk2 1991-1993(Christian Hayes, Tim Smith, Jon Poole)
• Ponce (Jim Smith)
• Ring (Christian Hayes - prior to joining Cardiacs)
• The Sea Nymphs (Tim Smith, Sarah Smith and Bill Drake)
• The Shrubbies (Dominic Luckman - after leaving Cardiacs)
• Tim Smith's OceanLandWorld (Tim Smith's solo project)
• The Sound (Colvin Mayers - after leaving Cardiacs)
• Spratley's Japs (Tim Smith) 
• The Trudy (Peter Tagg and Ralph Cade - after leaving Cardiacs) 
• The Wildhearts (Jon Poole - after leaving Cardiacs)
• Also listen out for Tim Smith's production for Sidi Bou Said (Bodies on Ultimate, 1995) and other bands too (eg. Eat's 'Epicure', Fiction 1993)

Source: Wikipedia