BBCW, "Of the father's love begotten" is one of my favourite carols, and I was surprised that in my (reasonably northern) church, few seemed to know it. Some think its new, when of course the melody goes back at least to Piae Cantiones, and the words are a Victorian translation of 4th/5th century latin. Its about the oldest song in most hymn books. It could be a north/south thing though, because we used to sing it a lot in Canberra.