Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

Who is the husband of Helen of Troy in Troilus and Cressida?
menelaus

Which former 'Have I Got News For You' presenter made an occassional appearance as Patrick in 'One Foot In The Grave'?
angus deayton

In which short-lived soap set on a North Sea ferry did Kate O'Mara play Catherine Laker?
triangle