.Believe it or not, the UK Christmas charts should be called "The Run Up" or "Near To Christmas" Due to the data of sales and units before Christmas Day, But it's been Branded as Christmas Charts, as has been this way as it been going for many decades.
But As Media, TV and Radio is always A Week Early for broadcast as the sales, streams and units is always before the 1st Day Of Christmas (Than At Christmas) this is the most misleading charts, but special, and traditional at the same time, just because of the week ending systems, it hasn't really sparked as a big way, of taking it complained board or further action required.
For Example the Branded Christmas charts should take in count of sales, units and streams at Christmas Day at least or the week of, or always be broadcasted & branded After Christmas Day to the new year, So in 2021, is From 31st December weekly edition is Christmas Week data from 24th to 30th December, Vs Media Edition Branded 24/25th December from 17th to 23rd December Data only.