This version is kinda shit, it's not a song that should be sung by a single singer. It's a big orchestral choir song, the more people that sing it, the better, huge stadiums in fact. Obviously the Proms are full of crackers so avert your eyes to the video but this is a much better example of that song: https://youtu.be/sERiPuOQyvo
Yes this song is also where /r/greenandpleasant gets its name, partially ironic and partially because nobody wants to use "United Kingdom" for a leftist community, particularly when we'd want to replace it. Jerusalem is a song about that, claiming England is kinda naff and we must work tirelessly to improve it.
Double Edit: Bots gone mad. Changed as per instructions with a yewtube link. Deleted anyway apparently. Let's see if a new comment works. This is literally
I think "Jerusalem" is great, personally. I mean, it's certainly better to have an anthem that, if religiously, describes the England of today as full of "dark, Satanic mills" and asserts that this current state of affairs must be tirelessly resisted; than to have an anthem like "Land of Hope and Glory", that basically says England is awesome and great and mayhaps should continually expand by the grace of God.