It’s the summer season and as part of Rose’s ‘coming out’ she is to be presented at Buckingham Palace.
The family and servants are at Grantham House, their London residence, preparing for the busy social program.
Not one to miss such a grand occasion, Cora’s mother, Martha Levinson makes the journey from New York with her playboy son Harold, fresh from his recent brush with the law.
Both outspoken and larger-than-life, will they make an impression amongst certain members of London’s high society?
Downstairs, Daisy gets an unexpected invitation and Carson treats the staff to a special day out.
But, when the Crawleys are implicated in a scandal that threatens to engulf the monarchy, what lengths will Robert go to in order to protect the royal family, and his own?
The Christmas special The London Season will air on Christmas Day at 8.30 p.m in the UK.