[1] Her grandfather, Edwin Earl Norris, was a cabinetmaker and musician, playing horn and viola in the Newark Symphony Orchestra.
[9] Her best-remembered performance is the lead role in the erotic film Emily (1976), directed by Henry Herbert, 17th Earl of Pembroke.
Of working with her in Emily, actor Victor Spinetti later wrote "I found Koo Stark to be an enchanting girl and terribly bright and interesting".
She appeared in the comedy Eat the Rich (1987), and then featured in "Timeslides", an episode of the sci-fi show Red Dwarf (1989), playing Lady Sabrina Mulholland-Jjones, the fiancée of a more successful Dave Lister.
[16] In September 1987, she returned to the stage, taking the part of Vera Claythorne in Agatha Christie's And Then There Were None at the Duke of York's Theatre.
[29] On 22 April 1987, a charity auction at Christie's, St James's, for the Campaign to Protect Rural England, featured signed work by David Bailey, Patrick Lichfield, Don McCullin, Terence Donovan, Fay Godwin, Heather Angel, Clive Arrowsmith, Linda McCartney, Koo Stark, and fifteen others,[30][31][32] Views by Stark, including some of Kirby Muxloe Castle, were in G. H. Davies's England's Glory (1987), a CPRE book launched at the same time.
[36] A solo exhibition hosted by the Leica gallery in Mayfair in May 2017 was entitled Kintsugi, a Japanese word for a way of renovating things that have been broken.
[40] Stark married Tim Jefferies, manager of a photographic gallery, in August 1984,[46] at St Saviour's, Chalk Farm, with the minister, Christopher Neil-Smith, commenting that "It was such a quiet affair you wouldn't have known it was happening.
[48] In 1988, Stark brought a successful libel action against The Mail on Sunday over an untrue story headed 'Koo dated Andy after she wed'.
[50] In another libel action in 2007, Stark won an apology and substantial damages from Zoo Weekly magazine, which had described her as a porn star.
[5] In November 2012, Stark appeared at Hammersmith magistrates court accused of stealing a painting by Dutch master Anthonie van Borssom, worth £40,000, from the home of her ex-partner, American financier Warren Walker.
[52] In November 2022, Stark was awarded substantial damages and received an apology in a court case brought against Daily Mail's parent company for a 2019 article which falsely referred to her as "a soft porn actress".
[53] About 1993, Stark was hit by a taxi in Old Compton Street, London, losing two teeth and also suffering a deep wound to her forehead, after a collision with her camera.
[27] In 2002 Stark was diagnosed with breast cancer and underwent a double mastectomy and chemotherapy, causing her to lose her hair for a time.