<P> In July 2010, producer Paula Mazur announced that a script based on the 2008 novel of the same name, written by Mary Ann Shaffer and Annie Barrows had been picked up by Fox 2000 Pictures . Despite a lack of financial incentives, Mazur stated she wanted the adaptation to be filmed on the titular island of Guernsey, stating "It's all a matter of economics and what looks right, but I can't imagine not filming in Guernsey ." Several actresses were mentioned as potential cast members, including Kate Winslet, Anne Hathaway and Emily Blunt . On 4 August 2011, it was announced that Kenneth Branagh was set to direct the film, with filming aimed to commence in March 2012 . </P> <P> On 13 January 2012, Winslet agreed to portray the lead role of Juliet Ashton . However, in April 2012, the film was delayed for another year due to scheduling conflicts . In February 2013, Winslet dropped out of the project, alongside then - director Branagh . In April 2013, Michelle Dockery was offered the lead role, though she later declined . In February 2016, Mike Newell was announced to direct the film, with Rosamund Pike circling for the lead role . StudioCanal would finance and distribute the film . Eventually, in October 2016, Lily James was confirmed to star as Juliet . In March 2017, Michiel Huisman and Glen Powell both signed for the roles of Dawsey Adams and Mark Reynolds respectively . The film entered pre-production in January 2017, with filming set to commence in spring . </P> <P> Principal photography began on 21 March 2017 in North Devon, England . Exterior shots were filmed at Princes Wharf, Bristol to represent Weymouth Docks in 1946 . For the London portion of the shoot, photography took place on Sicilian Avenue . Scenes were also shot at the House of Detention in Sans Walk, Clerkenwell . Studio work was completed at Ealing Studios . Filming wrapped on 15 May 2017, with the first official images of the film released . </P> <P> The film premiered in London on 9 April 2018, and was theatrically released in the United Kingdom on 20 April and in France on 13 June by StudioCanal . It will be released in other international areas, such as the United States, Canada, Latin America and certain parts of Europe, by Netflix as an original film on 10 August 2018 . </P>

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