So if the day after Christmas is called Boxing Day, is the day after Easter called Boxing Helena Day?
There is another Limey-ism in this story, in addition to Boxing Day.
"The seismologist declined to punt on what would happen next"
In North America, the slang use of "punt" is to quit on something, "uh oh, time to punt"
With these Brits and ex-colonists, "punt" means bet, wager, throw a few bob on, etc.