New Casting additions for Season 4 include:

Tom Cullen as Lord Gillingham, an old family friend of the Crawleys who visits the family as a guest for a house party

Nigel Harman as Green, a valet

Dame Harriet Walter as Lady Shackleton, an old friend of the Dowager

Joanna David in a guest role as the Duchess of Yeovil

Julian Ovenden as aristocrat Charles Blake

Dame Kiri Te Kanawa as a guest who sings in the house

Gary Carr as a jazz singer named Jack Ross