Scone is a bohemian artist who also comes from a life of privilege.
Having lived in Paris, Scone is experienced in modern art styles. As a rising name he has been commissioned by Richard Bellamy to paint a portrait of his wife Lady Marjorie.
Scone also persuades Sarah to pose for him in her spare time at his studio.
The Bellamys are aghast to find a portrait of Lady Marjorie side by side of another one of their servants at a public exhibition. Sarah is shown scantily clad.
The Bellamys have both Sarah and Rose fired. They wrongly think that Scone must have snuck up Sarah's room to get her to pose along with Rose.
It is only the second episode and once again Sarah causes trouble with Rose being an innocent victim. It also shows how precarious the life of a servant can be. Fired over a misunderstanding and no support from other servants.
Sarah is willing to go to battle with the Bellamys. It is left to Scone to salvage something for both Sarah and Rose. The question is will he discard Sarah now that he has used her?
You can already see the contrast with this and Downton Abbey. The latter was written by a toff who lived the upstairs life. The creators of Upstairs Downstairs are strongly side with the servants.