First picking up Nurses. Most Hospitals try to avoid pre planned appointments.
Although my Sister works in a Renal Unit. So although not working Christmas Day or Boxing Day, the bank,holiday in liru of Christmas judging previous years, is a working day. So even the front line NHS accommodates as much as possible time off.
I work for a major logistics company, contracted to a high street name. Said name this year was taken over by another high street name ( may give things away).
When the site opened Christmas Day, Boxing Day and New Years Day were and remain holidays. Recently we have started Sunday shifts, but good will gives us Easter Day (Sunday) off.
The trouble is with a decline in manufacturing many people now work in service industry, often on low pay. For them working unsocial hours through the year it is still seen that Christmas is family time. I am lucky although single to be close to parents. Other single and married folk, wanting family time face long drives and to be having to come home for work Boxing Day puts a strain on them.
The same though across the board. Being a small town (100,000) people Boxing Day has no buses or trains. So can see how some non essential workers question working.