<P> The Left Bank producers noted that Smith was paid more than Foy in the first two seasons, partially because of his Doctor Who fame . This information brought up discussion on the gender pay gap, including the creation of a petition asking Smith to donate the difference between his and Foy's salary to the Time's Up Legal Defense Fund . Left Bank later issued an apology to Foy and Smith for putting them "at the center of a media storm...through no fault of their own ." Left Bank also clarified that they "are responsible for budgets and salaries; the actors are not aware of who gets what, and cannot be held personally responsible for the pay of their colleagues ." They added that they support "the drive for gender equality in film and TV and (were) eager to talk to the British Time's Up campaign and (were) already speaking to Era 50: 50, a group campaigning for gender equality on screen and stage ." Suzanne Mackie, Left Bank's creative director, did note that moving forward, no other actor would be paid more than the actress portraying the Queen . Regarding the controversy, Foy was "not (surprised about the interest in the story) in the sense that it was a female - led drama . I'm not surprised that people saw (the story) and went,' Oh, that's a bit odd .' But I know that Matt feels the same that I do, that it's odd to find yourself at the center (of a story) that you didn't particularly ask for ." </P> <P> The producers will recast some roles with older actors every two seasons, as the timeline moves forward and the characters age . In October 2017, Olivia Colman was cast as Queen Elizabeth II for the third and fourth seasons . By January 2018, Helena Bonham Carter and Paul Bettany were in negotiations to portray Princess Margaret and Prince Philip, respectively, for these seasons . However, by the end of the month Bettany was forced to drop out due to the time commitment required . By the end of March 2018, Tobias Menzies was cast as Prince Phillip for the third and fourth seasons, and Carter was confirmed to have been cast . </P> <P> An estimated 25% of the first season was filmed at Elstree Studios in Borehamwood, Hertfordshire, with the remainder filmed on location, altogether taking 152 days . Sets for private quarters, the interior of a private jet, the cabinet room, and the exterior of 10 Downing Street, were built at Elstree Studios, while Lancaster House, Wrotham Park and Wilton House were used to double as Buckingham Palace . Ely Cathedral stood in for Westminster Abbey, while locations in South Africa doubled as Kenya . Additional locations in the UK included Eltham Palace, the Royal Naval College, Goldsmiths' Hall, Shoreham Airport, New Slains Castle, Balmoral Castle, Cruden Bay, Lyceum Theatre, Loseley Park, Hatfield House, The Historic Dockyard Chatham, Southwark Cathedral, Ardverikie House, Englefield House, and the Glenfeshie Estate . Filming on the second season began in early October 2016 . Each episode of the first two seasons would shoot for about 22 days, with each costing about GB £ 5 million (US $7 million) to produce . The third season is expected to begin filming in July 2018 . </P> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table>

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