Just a thought, I wonder if the letter only goes up to the 3rd December with your current rate of £114.10 as the £10 Christmas Bonus is normally paid in the first full week of December which would mean your weekly rate for the following week is slightly higher but they haven’t notified you of this yet?
I got one of them too, does yours also inform you that you will be getting £10 extra christmas bonus? if yes I think (hope ) it is just a standard letter informing you of your bonus? If you find anything out other than above then please post, Ta