Wales's favorite hymn

His Royal Highness The Prince of Wales's favourite hymn is a little ditty called Westminster Abbey sung with the words, "Christ is made the sure foundation..." (and it's also sometimes sung with the alternative words, "Blessed city, heavenly Salem..."). I found this very interesting recording on YouTube (courtesy of that Canadian history doctoral candidate boy who reads my blog) from some cathedral in England, but, um, I don't think they are singing the official, sanctioned, and approved words......