The Titanic beauty was due to begin shooting actor/director Branagh's next film, The Guernsey Literary and Potato Peel Pie Society, this spring, but the project has been delayed due to "continued casting and timing issues", according to a representative for Guernsey's Commerce and Employment Department.
And the movie's creative producer Paula Mazur is convinced the postponed schedule will work in the crew's favour.
She says, "It really is important to get the right cast on board... It (the delay) will also allow for the shoot to take place when the wild flowers and vegetation are at their best in Guernsey, which personally was my ultimate goal."
The movie is based on Mary Ann Shaffer and Annie Barrows' bestselling 2008 book, about a group of Guernsey islanders who outsmarted their German occupiers during World War Two.
Winslet will play a modern-day magazine columnist who uncovers evidence of the book club the locals set up amid the chaos of war.