While the film recently confirmed the exciting news that the cast and crew had returned to set to commence production on the sequel - fans were saddened to learn that the release had been pushed back to early 2022.
In the meantime, we'll have to enjoy returning to the boxset again and again!
But since the series wrapped five years ago, what else have the main cast members been up to? Click through the gallery to take a look…
Hugh Bonneville – Robert Crawley, Earl of Grantham
Hugh Bonneville had one of the show's lead roles as Robert Crawley the Earl of Grantham. Since the show wrapped, Hugh has gone on to star in many other roles such as in W1A, The Hollow Crown and the Paddington films. Hugh also reprised his role for the 2019 Downton film.
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WATCH: Hugh Bonneville looks unrecognisable during appearance on The One Show
Elizabeth McGovern – Cora Crawley, Countess of Grantham
Playing the role of Robert Crawley's wife, Cora, was Elizabeth McGovern. Elizabeth enjoyed a hugely successful acting career prior to Downton, but has had a number of other roles since the show finished.
Since Downton, Dan has appeared in many shows and films such as Legion, Beauty and the Beast and Night at the Museum.
Dame Penelope Wilton – Isobel Crawley
Like many of the actors in the show, Dame Penelope Wilton had many major roles prior to Downton. Most recently, however, she's known for appearing in Ricky Gervais' Netflix series After Life as Anne.
Lily James – Lady Rose MacClare
Lily James played Lady Rose when she joined the show in 2012 until its final series. More recently, she's been doing theatre work in All About Eve, and appeared in films such as Mamma Mia! Here We Go Again and Yesterday.
Jim Carter - Mr Carson
Jim Carter is another veteran of actor who's enjoyed plenty of well-known roles prior to appearing as Mr Carson in Downton Abbey.
Since the show wrapped, however, he has completed a couple of other roles in films such as The Good Liar and Swimming with Men.
Brendan Coyle - Mr Bates
Brendan Coyle was one of the many actors in Downton that received high praise for his supporting role. He received both a BAFTA nomination and a Primetime Emmy Award nomination. Since the show he has starred in Mary Queen of Scots alongside Margot Robbie and Saoirse Ronan, and BBC drama Requiem.
Joanne Froggatt – Anna Bates
Playing Mr Bates' wife Anna is Joanne Froggatt. After Downton, Joanne went on to play Laura Nielson – the lead role in ITV drama Liar alongside Ioan Gruffudd.