As I mentioned when I started this series, one of the important features of the Christmas number one tends to be that the novelty song can win through. The first occasion when that could be said to have happened in my lifetime was 1971 - and indeed, over the next few days there's going to be several examples of this.
So, 1971 - and at number one on Christmas day, a comedy legend with what turned out to be his last and greatest hit. Like many other comedians, he had a few minor hits in the 1950's and 1960's, but for time immemorial Benny Hill will be remembered for his eulogy to Ernie.
And in the US - have you noticed a certain serendipity creeping into the songs that are popular in the UK and the US for Christmas? No? Well, at number one on December 25th 1971 was this little ditty.