The stars of Downton Abbey walked the red carpet in London on Wednesday evening for one last time as the hugely successful English country house saga finally comes to an end.

Much of the original cast, including Hugh Bonneville, a pregnant Michelle Dockery, Jim Carter, and Phyllis Logan, turned out for the world premiere of Downton Abbey: The Grand Finale in central London's Leicester Square.

They were joined by other cast members, including The Wire star Dominic West and Joely Richardson, best known for the drama series Nip/Tuck.

The film, which will be released in cinemas in France on 10 September and worldwide two days later, will be Downton's last outing following six seasons and two earlier films.

At its height, Downton Abbey - the fictional tale of the aristocratic Crawley family and their servants - was watched by an estimated 120 million people in 250 territories worldwide.

The show also garnered many famous fans with big names, from Michelle Obama to Mick Jagger, all happy to let it be known that they were devotees.

The television series, created by Julian Fellowes, first aired in the UK in 2010 before conquering the world.

Millions tuned in weekly or devoured box sets to follow the intertwined fortunes of the Crawleys and their small army of servants.

Upstairs, downstairs
Above stairs, fans immersed themselves in the lives of patriarch the Earl of Grantham, played by Bonneville, and his daughter Lady Mary, played by Dockery.

The earl's mother, the Dowager Countess of Grantham, was famously depicted by the late acting legend Maggie Smith.

Below stairs, the drama focused on the lives of characters such as butler Charles Carson (Jim Carter), housekeeper Elsie Hughes (Phyllis Logan), cook Beryl Patmore (Lesley Nicol), and an ever-changing cast of maids, valets, and footmen.

The third and final film sees Lady Mary at the centre of a public scandal as the family face financial turbulence that has consequences for the entire household.

Faced with the end of their favourite show, fans have been snapping up mementoes.

Memorable props and costumes are being sold by London's Bonhams auction house.

The online sale, which began last week and runs until mid-September, includes Lady Mary's wedding dress and tiara, a telegram informing the earl of the start of war in 1914, and the servants' "bell wall" by which they could be summoned by their masters.

Other props on offer include butler Mr Carson's pewter hip flask and silver pocket watch, as well as some of cook Mrs Patmore's aprons.

Downton Abbey: The Grand Finale opens in Irish cinemas on Friday 12 September.
Watch: The trailer for Downton Abbey: The Grand Finale
Source: AFP