Sarah tells of the rare lady slipper orchid once thought to be extinct. The wild Cypripedium calceolus was declared extinct in England in 1917 but later a very few plants were found. These few English plants are seriously protected, sometimes with Police guards. However, that species is common throughout Europe and Asia. FYI, there are over 160 different species of lady slipper orchid, mostly in Europe, Asia, and North America.
The older Stuart Mosely in the photo is not the same older Stuart Mosely in the episode who interacts with the characters. Generally when this happens the person in the photo is a stand-in before the actor is actually cast.