Thank you for all the new suggestions. I'm sure I'll forget to respond to some - sorry if I do.
Philoslothy, this is not about me or anybody else expecting someone to work in their holiday. The point is, an NQT has emailed me to say they are not coping despite spending the holiday working.
If that is true that raises grave concerns about how they manage their workload, and if it is not true their first instinct, after seeing they won't finish the marking by Monday, is to ask me to step in and help.
Neither of these two scenarios are acceptable.
I am going to have to have a very honest and very difficult, for both parties, conversation tomorrow. The problem is, I feel as if I am constantly on his case about something or other and as a result he must dread seeing me, but he simply doesn't listen.
Madonna, he chose to do an FE PCGE despite wanting to teach in secondary schools 
MrsYoung - I'm not sure about the context of that comment but apologies if an error I made offended you in some way.