Question: In the United Kingdom, who was the publisher of the book for which Steffan Rhodri played Reg Cattermole in the movie?

Context articles: List of Prisoner episodes
Chepstow Community Hospital
Steffan Rhodri
Joy Division (2006 film)
WhizzKids United
The Bill (series 2)
Ripples Foundation
Llanybydder
General Product Safety Regulations 2005
Harry Potter and the Deathly Hallows

"Prisoner" (Internationally known as "Prisoner: Cell Block H" in the United States and United Kingdom) is an Australian soap opera created by Reg Watson.
 It was produced by the Reg Grundy Organisation and premiered on Network Ten on 26 February 1979 in Sydney and 27 February 1979 in Melbourne.
 After 8 seasons and 692 episodes, the series concluded on 11 December 1986.
Chepstow Community Hospital in Chepstow, Monmouthshire, Wales accepted its first patients on 26 February 2000 having been developed under the United Kingdom Government's Private Finance Initiative.
 It was officially opened on 27 October by Rt Hon Rhodri Morgan AM MP, the First Minister for Wales.
Steffan Rhodri (born 1 March 1967) is a Welsh film actor, best known for portraying Dave Coaches on "Gavin & Stacey" and as Reg Cattermole in "Harry Potter and the Deathly Hallows" part I.
Joy Division (stylised as JOY DIVISIOИ) is a 2006 British-German-Hungarian film directed by Reg Traviss.
 The story is a fictional biopic which follows the life of a boy in Germany at the end of World War II into his adulthood in Russia and London during the Cold War.
 The script was written by Reg Traviss and Rosemary Mason and went into production in 2004 after completion of Traviss' short film JD Pilot in 2003, based upon the same script and which also starred Ed Stoppard in the role of adult Thomas.
 "Joy Division" was shown for the film industry at the Cannes Film Festival European Film Market and at the American Film Market in 2005.
 It was invited to screen at the Copenhagen International Film Festival in 2006 and was released theatrically in the United Kingdom in November 2006.
WhizzKids United is a youth HIV / AIDS prevention, care, treatment and support programme that uses football as an educational medium to facilitate healthy behaviour change.
 The programme is based in Durban, South Africa and is run by Africaid, a registered charity in the United Kingdom (Reg.
 No. 1045461) and South Africa (Reg.
 No. 051-379-NPO).
The second series of "The Bill", a British television drama, consisted of twelve episodes, broadcast between 11 November 1985 and 10 February 1986.
 The series was released on DVD on 26 October 2005 in the United Kingdom, before being made available as part of a three-season box set on 10 May 2006 in Australia.
 The series was made available as a separate season in Australia on 3 August 2011.
 The above DVD artwork is taken from the most recent Australian release.
 It features an image of PC June Ackland.
 The British artwork features a collage image featuring PC Reg Hollis, Supt Charles Brownlow, Sgt Bob Cryer and DS Ted Roach.
 The original Australian three-season box set features a sole image of Sgt Bob Cryer.
 The initial DVD release of the season in the United Kingdom suffered from technical faults, with the episodes on disc one being replicated on disc three by mistake.
Ripples Foundation (also known as BME Concern or Ripples In Africa) is a British non-governmental organization (Reg No. 1116698) that works primarily with women in the United Kingdom, United States, and the countries of Nigeria, Cameroon, and Ghana to alleviate extreme poverty in Africa.
 The organization often partners with other organizations in order to meet its goals of "supporting women in distress, promoting inclusion and community cohesion, and working to raise levels of tolerance through education, art, sports, and culture."
Llanybydder (] , sometimes formerly spelt "Llanybyther") is a community and market town straddling the River Teifi in Carmarthenshire, West Wales, with a population of 1,423, almost three quarters of whom are Welsh-speaking according to the United Kingdom Census 2001.
 The population had increased to 1,638 at the 2011 Census.
 The nearest university is the University of Wales, Trinity Saint David, located in the nearest town, Lampeter (Llanbedr Pont Steffan).
 Mynydd Llanllwni (408 m) and Mynydd Pencarreg (415 m) are mountains to the east/south east of Llanybydder.
The General Product Safety Regulations 2005 is a 2005 Statutory Instrument of the Parliament of the United Kingdom that demands that "No producer shall [supply or] place a [consumer] product on the market unless the product is a safe product" (reg.5(1)) and provides broad enforcement powers.
 The regulations implemented European Union directive 2001/95/EC and revoked the General Product Safety Regulations 1994 (reg.1(2)).
 The regulations also repealed section 10 of the Consumer Protection Act 1987 which had previously imposed a more limited general safety requirement (reg.46(2)).
Harry Potter and the Deathly Hallows is the seventh and final novel of the "Harry Potter" series, written by British author J. K. Rowling.
 The book was released on 21 July 2007, ten years after publication of "Harry Potter and the Philosopher's Stone" (1997), by Bloomsbury Publishing in the United Kingdom, in the United States by Scholastic, and in Canada by Raincoast Books, ending the series that began in 1997 with the publication of "Harry Potter and the Philosopher's Stone".
 The novel chronicles the events directly following "Harry Potter and the Half-Blood Prince" (2005), and the final confrontation between the wizards Harry Potter and Lord Voldemort, as well as revealing the previously concealed back story of several main characters.
 The title of the book refers to three mythical objects featured in the story, collectively known as the "Deathly Hallows"—an unbeatable wand, a stone to bring the dead to life, and a cloak of invisibility.