He plays Milton, the American whom Roy's mum Sylvia has fallen for while away on her cruise.
The first pic of Robert Vaughn as Milton is available to view on the official ITV website along with a sneak peek at pictures of Tracy and Steve's wedding - that Becky will ruin, yay!
Have a look at the picture gallery here.
Robert Vaughn is well known for his iconic role as Napoleon Solo in The Man From U.N.C.L.E in addition to his many other television and film roles. His IMDB entry is here.
See also: Robert Vaughn gets Betty Driver's dressing room
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