Writer, 'Roy Clarke', was credited on screen as "Roy Clark" in the pilot episode.
The character credited simply as "Maid" is named in later episodes as "Lena" and the actress credited with playing her in the pilot episode and series one is named as "Julie Ann Taylor", though by the second series she has become "Judy Flynn" and incidentally the same actress who's probably best known as the stroppy secretary, Julie, in the sitcom, Brittas Empire.
Nora's surname in the series is "Renshaw" but this is never included in the credits.