I too remember singing this in the school choir when I was in junior school (it would have been around 1980-82). We also sang it in a inter-school performance, a "Festival of Music". The lyrics and the tune have always stuck with me (though sadly I've only ever been able to remember the first two verses) and I often sing it to myself while pottering around the house doing chores.

So good to have found the full lyrics! I shalln't have to sing just the first two verses over and over! :-D