I can't find much at all about this album. Here's the best I can do with what's available on the web:

Assuming the band's name is indeed The Proclaimers, the song's full title is "Baby Born in Bethlehem," and is song A3 on an eponymous album by The Proclaimers, which rateyourmusic.com dates to 1970, though there's a good chance that's simply an estimation. It was released on the Angelus label, Angelus WR-4684.

https://rateyourmusic.com/release/album/the_proclaimers__us_/the_proclaimers.p/