Some time ago I came across this site;
I’ve copied and pasted this from the home page which explains who they are and what they are about:
This website was initially created to provide resources for the Vocal Union project. All materials on the site are freely available to people working in community music and education.
We gratefully acknowledge financial support from the Sage Gateshead and Sing Up.
The site is currently hosted in collaboration with BlueJam.
It is a treasure-trove of lovely songs for all ages. I’m about to start running the singing assemblies at one of my schools this term and I can see that I’m going to include a few of these. Like this one, which looks like a nice little warm-up, and might even find its way into the Harvest Festival. Happy singing!