He portrayed Martin Downes, the only child of Bet Lynch who, it is implied, is connected to current Coronation Street storylines concerning Laura Neelan.
He went on to take another part immediately after the show closed, again at the RSC, but this time on Twelfth Night alongside Dame Diana Rigg under the directorship of Clifford Williams.
In his early twenties, Selwyn appeared in the West End at the Ambassadors Theatre as Mick Jagger in a production of Rayner Bourton's Let the Good Stones Roll.
The final production at the Olivier Theatre in December 1979 was Henrik Ibsen's The Wild Duck, alongside Sir Ralph Richardson.
The series was considered a television milestone, dealing with difficult subjects surrounding World War II, it was based on the book by Leon Uris.
He later played a small part in Tender Is the Night, Dennis Potter's BBC adaptation[8] of the F. Scott Fitzgerald novel of the same name, starring Timothy West.
Caught Looking[9] was a 1991 short film starring Selwyn as the "voyeur", alongside iconic actor and activist Bette Bourne as narrator.