Thanks for the lyrics: it is also sung by Jack Beck, and by Archie Fisher (who of course worked and recorded with Garnet Rogers).
There is a wonderful CD called Gentle Giants (A Celebration of the Clydesdale Horse in Song)which has to be on your Christmas list, those of you who have such fond personal memories of heavy horses. See: http://www.greentrax.com/music/artists/reviews/Various-Artists-Gentle-Giants-A-Celebration-Of-The-Clydesdale-Horse-In-Song/