Mind your Ps and Qs is an English expression meaning "mind your manners", "mind your language", "be on your best behaviour" or similar.
Tom Bennett, raised in Glasgow, is best known for his online blog "The Behaviour Guru" of which spawned his first book, "The Behaviour Guru: Behaviour Management Solutions for Teachers".
"Best Behaviour" is a song by British hip hop group N-Dubz.
 The song was produced by Dino Contostavlos and Richard Rawson and co-written by Tula Contostavlos, Mr Hudson, Tony Dixon, Fazer and Dappy.
 It was released on 17 October 2010 as the second single from N-Dubz's third studio album, "Love.Live.Life".
 Musically, the song is a R&B ballad with prominent British hip hop characteristics.
 The initial writing consisted of the group being inspired to pen a song for their launch in the United States in addition to Dappy's feelings for his girlfriend, Kaye Vassell.
 It was inspired by the group's touring lifestyle and their enthusiastic fans.
 Lyrically, it is about trading one-night stands with people in favour of real love.
Ispočetka (trans.
 "From the beginning") is the 10th studio album by Dino Merlin, and was released on 9 June 2008.
 The first single promoting the album, "Otrkit ću ti tajnu", was released in August 2007 as a free download in partnership with BH Telecom.
 He signed a contract with Croatia Records, MPBHRT and City Records.
 One of the songs, named "Dabogda", from the album is done with Hari Mata Hari, the famous Bosnian singer.
 The complete song is written by Dino Merlin.
 Ispočetka is in the top 10 best selling albums 2008 in Serbia
Costadinos Contostavlos (born 11 June 1987), better known by his stage name Dappy, is an English singer, songwriter, rapper, and actor.
 He is best known for being the lead singer of the Camden-based grime trio N-Dubz, with his cousin Tulisa, and Fazer.
 He was known for his slightly unusual dress sense and his love for what he describes as "eye-catching headwear".
 His trademark was wearing a selection of woolly chullos (sometimes referred to as "Dappy hats"), turning up one or both of the ear-flaps of the hat.
Tula Paulina "Tulisa" Contostavlos (born 13 July 1988) is an English singer-songwriter, former X Factor judge, actress, and television personality.
 Tulisa is known for her role in "Demons Never Die", for her debut single as a solo artist titled "Young", and for being a part of N-Dubz.
Chester William "Chet" Powers, Jr. (October 7, 1937 – November 16, 1994) was an American singer-songwriter, and the lead singer of the rock group Quicksilver Messenger Service.
 He was also known by the stage name Dino Valenti (alternatively rendered as Dino Valente) and, as a songwriter, as Jesse Oris Farrow.
 He is best known for writing the quintessential 1960s love-and-peace anthem "Let's Get Together."
A reader model is the term used for the hypothetical average person who is the target audience for a product.
 A reader model can be made from the average behaviour of many product users by datamining things like loyalty cards. Based on data collected from datamining an 'ordinary individual' (everyman) can be constructed (modeled) to develop the best strategy for selling to consumers. Reader models are used by corporations to direct consumer behaviour to their products.
 Marketing, advertising, and product placement use reader models as a central part of their planning and source the reader model by using focus groups.
 In plain language a reader model is used by corporations to predict who will buy the better mousetrap.
 The 'everyman' is used by commercial musicians, writers, and the movie industry trying to make money from a product that will appeal to a mass audience.
 These industries use the reader model to try to gauge and predict the consumer market in an effort to create and profit from a hit single, best seller, or a box office hit movie.
 A well-known example is the success of Jaws (novel), the Jaws (film), and the theme music Jaws (soundtrack).
"Best Behaviour" is a song by British singer Louisa Johnson.
 It was released as a single on 3 March 2017, as the second single from her forthcoming debut studio album planned to be released in 2017.
 The track was written by TMS, Shungudzo Kuyimba, and Danny Parker.
Yoo Gun-hyung (Hangul: 유건형; born February 14, 1979) is a South Korean recording artist, songwriter, and producer best known as the co-writer and co-producer of the 2012 worldwide hit song "Gangnam Style" performed by co-writer PSY.

Question: which movie is the co-writer of Dino Contostavlos of the song "Best Behaviour" known for?
Answer: Demons Never Die