many NHS staff do not work over Christmas. It really is only those who work in essential services that have to work. Many staff don't have to work on Christmas Day, Boxing Day or any other public holiday. There are no outpatient clinics on those dates, for example, no scheduled operations, and hardly any clerical staff will be on duty.
This debate surfaces every year, and opinion normally becomes extremely polarised! In my opinion, it all comes down to money in the end - and I doubt that there will be many routes that would turn a profit on Boxing Day given the costs of running the service. After all, we are often told how few services actually break even, and with far fewer travellers on Boxing Day, I really can't see it happening.
As for Christmas Day, there is absolutely no chance!