FILMING for a new TV series featuring a Downton Abbey star and a Black Mirror actor is set to begin.

The new show is based on Sunday Times bestselling novel Flatshare by Beth O’Leary.

The story follows the life of two cash-strapped people in their mid-twenties, Tiffany and Leon, who agree to split the cost of renting a bed but not to meet.

However, their plan meets complications when they seem to fall in love via post-it notes.

Filming for the new series has already begun in Bristol, and will also take place in Brighton and London soon.

Jessica Brown Findlay, best known for her portrayal of Lady Sybil Crawley in the ITV period drama series Downton Abbey, will play Tiffany.

Meanwhile, Anthony Welsh, who featured in Fleabag as Jack and in the Black Mirror episode Crocodile, will play Leon.

Miriam Brent, Rory Aitken and Eleanor Moran, executive producers at production company 42, said: “We are thrilled to have the opportunity to bring Beth O’Leary’s captivating bestseller to television.

“Bursting with wit and heart, Flatshare is the perfect love story for a global millennial audience.

“Adapted for the screen by our incredible showrunner Rose Lewenstein, and helmed by Oscar-nominated director Peter Cattaneo, the creative team is a dream come true.

“With Jessica Brown Findlay and Anthony Welsh as our leads, we can’t wait for audiences to fall in love with Tiffany and Leon all over again.”

Author Beth O’Leary rose to fame after her book Flatshare made its way onto the Sunday Times bestseller list and was translated into 33 languages.

She has written four books in total, including fellow bestseller The Switch.

Also featuring in the show will be Bart Edwards, who stars in The Witcher, and will play Tiffany’s ex-boyfriend Justin, and Shaq B Grant, known for his portrayal of Raheem in drama Gangs Of London, will play Leon’s brother Richie.

Other notable faces in the show include Shaniqua Okwok, who played Solly Babatunde, sister of Roscoe Babatunde in It’s A Sin, and Jonah Hauer-King who stars in World War Two drama World On Fire, who play Tiffany’s best friends Maia and Mo respectively.