He would only be able to do that it he had someone to swap with - because if he’s on the rig it means someone else is at home - and if he’s gone on to get home for Xmas it would mean someone else then being on the rig for Xmas when they would be at home....I think Lee has gone back to work early so he can have Christmas off. She would never manage Christmas on her own.
they don’t do Christmas themselves anyway- they spend it with her parents every single year so honestly I dunno why he would bother chopping and changing to be home, but then this is the selfish Meldrum’s so the wee prick has probably fucked around with the rotation just to be a twit.