Bank holidays usually affect when payday arrives and that’s no different for benefit payments. Because of these Christmas bank holidays, this year, if you usually get money on the 26th or 27th of each month, it'll come through on December 23.
That is because Boxing Day is a bank holiday and the 27th is a "substituted" bank holiday day for Christmas Day. Payments aren't made on these days so you’ll get paid on the first day before the bank holidays, which will be Friday, December 23rd.
Unfortunately, if the 23rd rolls around and you haven’t been paid as you expect, there’s little that can be done as banks will be closed until the 28th. After this time payments should be processed and with you on time.