They all put their decorations up at the beginning of December, some even earlier. They take them down on New Year’s Day.
A drive from the edge of the town to my home yesterday found only a few houses with Christmas lights on, and in my road only one house in addition to mine had bravely kept their decorations until Twelfth Night.
I read this year that the Church recommends 17th December as the date for decorations to go up, although they themselves usually decorate churches from the start of the month. I don’t put mine up until about that time, with this year being the 19th.
It is a pity that people either don’t know or just ignore the traditional Twelfth Night.