Flemish farmhand

Rose and Anna went to a thé dansant in York. Rose danced with Sam Thawley, a gardener at an estate near Downton Abbey. He was smitten with Rose. I was rather smitten with the actor that played the role, Jonathan Howard, and couldn't figure out exactly why when I watched the episode. And, then, aha. He's a candidate for a portrait by Hans Memling or Hugo van der Goes or Dirk Bouts.

The scene at the thé dansant:
https://www.youtube.com/watch?v=eaowBaLkjNc
The scene in the kitchen yard, in which Sam visits Rose and she plays the maid:
https://www.youtube.com/watch?v=bIiSYwJaKh4