Sinead Keenan is an Irish actress with a wide range of television, film and stage credits.
 Keenan is best known to Irish viewers for playing Farrah Phelan in "Fair City" and is best known to UK viewers for playing the role of werewolf Nina Pickering on BBC Three's supernatural drama "Being Human", which began airing in 2009.
 Keenan has been a regular cast member since Series 3 began airing in 2011.
 In November 2011, Keenan's on-screen partner, Russell Tovey announced he would be leaving "Being Human" to work full-time on his BBC Three sitcom, "Him & Her".
 On 9 January 2012, it was announced by show creator Toby Whithouse and confirmed by Keenan on Twitter that she would not be appearing in the fourth series of the supernatural drama.
Graham Williams (24 May 1945 - 17 August 1990) was an English television producer and script editor.
 He produced three seasons of the BBC science fiction television series "Doctor Who" during Tom Baker's era as the Fourth Doctor.
Patrea Smallacombe (born 1961, Adelaide, Australia) is a prolific Australian writer and series script editor who contributed to numerous soap operas in her native Australia including "The Young Doctors", "Prisoner", "Neighbours" and "A Country Practice" before moving to the United Kingdom in 1987.
 Since then she has written for many high-profile shows including "Emmerdale", EastEnders, "Brookside", "Family Affairs", "The Bill" and also two separate stints penning scripts for the top rated ITV1 soap opera, "Coronation Street".
 In 1989 she was the script editor for Yorkshire Television's viewer controlled soap opera, Hollywood Sports.
 Her aunt was the equally prolific Australian television series script writer, Betty Quin.
Grownups is a BBC Three sitcom written by Susan Nickson, who also created hit BBC Three sitcom "Two Pints of Lager and a Packet of Crisps".
 It follows the trials and tribulations of a group of twentysomething friends in Manchester, facing the decision to either settle down or carrying on partying.
A script editor is a member of the production team of scripted television programmes, usually dramas and comedies.
 The script editor has many responsibilities including finding new script writers, developing storyline and series ideas with writers, and ensuring that scripts are suitable for production.
 The script editor will work closely with the writer at each draft of the script, giving the writer feedback on the quality of the work, suggesting improvements that can be made whilst also ensuring that practical issues like show continuity and correct running time are adhered to.
 Unlike the writers, script editors will usually be full-time members of the production team, working closely with the producer.
The Gemma Factor is a BBC Three sitcom starring Anna Gilthorpe, Claire King and Gwyneth Powell.
 The series was simulcast on BBC Three and BBC HD, a popular method of the time.
 The series premiered on Tuesday 9 March 2010, and has six episodes.
Barbara Emile is a British television producer.
 Emile contributed to the BBC soap opera "EastEnders" for several years.
 She first started working on the serial as script editor underneath producer Leonard Lewis, and she began producing the programme in 1992.
 Following the departure of Lewis in 1994, Emile was promoted to Executive Producer.
 Storylines that aired under her tenure included Sharongate, Nigel and Debbie Bates' wedding (an on-screen celebration that aired to mark the show's 1000th episode), and Ricky Butcher's love triangle with best friends Bianca Jackson and Natalie Price.
 Barbara cast actress Barbara Windsor as Peggy Mitchell.
 Innovating the writing talent, Emile introduced a pioneering structure to develop writing talent, led by Tony Jordan, Tony McHale, Ashley Pharaoh and Matthew Graham.
 In 1994 Emile took the programme from twice a week to three times per week.
 Under Emile's stewardship she led the series onto achieve ratings of 23 million viewers.
 Characters introduced included Tiffany Raymond, Roy and Barry Evans.
 She remained with "EastEnders" til early 1995 and was succeeded by Corinne Hollingworth.
Sally Head is a British television producer.
 She began as a television script editor, before working as a producer, mainly for the BBC.
 Her credits as producer include "First Born" (1988) and "The Life and Loves of a She-Devil" (1986) and she was executive producer of the first four "Prime Suspect" television films.
 She also worked on other seminal Granada dramas such as "Cracker" and "Band of Gold".
Susan Nickson is an English screenwriter, television producer, and script editor.
 She is the creator and writer of BBC sitcoms "Two Pints of Lager and a Packet of Crisps" (2001–2011) and "Grownups" (2006–2009).
Graduating from University College Dublin (UCD) with a PhD in Drama, she began working for Raidió Teilifís Éireann (RTÉ) as an assistant script editor on the Irish soap "Fair City" in 2000.
 After a promotion to Script Editor and successful stints as Story Editor and Producer on "Emmerdale", she transferred to the BBC.
 She worked as Series Story Producer on "EastEnders" under Kate Harwood.

Question: Which BBC Three sitcom that first aired 2006 was written by a an English screenwriter, television producer, and script editor whose initials are SN?
Answer: Grownups