I'm looking for the common name of actress Katharine/Katherine Schofield.

KATHARINE SCHOFIELD (10 titles, 10 confirmed)
- Department S (ep. 'Bones of Byrom Blain') (confirmed by T!M)
- Doctor Who (confirmed by Rutan)
- Half Moon Street (confirmed by SoylentDave)
- Hazell: The Complete First Series (ep. 'Hazell and the Walking Blur') (confirmed by Rutan)
- Minder on the Orient Express (confirmed by SoylentDave)
- The Naked Civil Servant (confirmed by SoylentDave)
- Nicholas and Alexandra (confirmed by MickySpoon)
- Out: The Complete Series (confirmed by SoylentDave)
- The Saint (ep. 'The Death Game') (confirmed by T!M)
- Thriller: The Complete Series (ep. 'The Colour of Blood') (confirmed by MickySpoon)

KATHERINE SCHOFIELD (6 titles, 2 confirmed)
- The Greek Tycoon
- Lifeforce (confirmed by MickySpoon)
- Pope Joan
- The Saint (ep. 'The Angel's Eye') (confirmed by T!M)
- Tom's Midnight Garden
- Virgin of the Secret Service

With that, we have ourselves a winner: Katharine Schofield. Thanks to all who helped out!

Nicholas and Alexandra -> Katharine Schofield as Tegleva

Doctor Who
(The Velvet Web) -> Katharine Schofield as Sabetha
(The Screaming Jungle) -> Katharine Schofield as Sabetha
(The Snows of Terror) -> Katharine Schofield as Sabetha
(Sentence of Death) -> Katharine Schofield as Sabetha
(The Keys of Marinus) -> Katharine Schofield as Sabetha

Thriller: Season 1: Episode 5: The Colour of Blood -> Katharine Schofield