Zs. K. Ekler was on Coal Hill School's list of the dead. (TV: For Tonight We Might Die) They died sometime before April 1963. (PROSE: Time and Relative)
Behind the scenes Edit
Given the letter Zs in their first name, and their surname, Ekler was, without a doubt, Hungarian.
Zsofia Ekler is a set designer on Doctor Who, and a draughtsperson on Class. The name on the board is likely in reference to her.
In The Woman Who Fell to Earth, an episode of series 11 Doctor Who, "Zsof's World Part 6 of 20 | Cake" is a YouTube video uploaded by the channel "Z Ekks", another reference to Zsofia Ekler.