This is one of the most British Christmas carols. In fact, the first time I recall hearing it was when I was living in what was then the British Crown Colony of Hong Kong. I heard the carol sung in the Chinese Baptist church in Kowloon where I attended, then I heard it at the midnight mass on Christmas Eve at St. John's Anglican Cathedral on Hong Kong Island. It is often the leading hymn for the traditional lessons and carols service. Here it is being sung at King's College, Cambridge.