An article by Tony Inwood on this website described Caldecott Community Meetings in the Library at Mersham-le-Hatch generally held on a Sunday near the start and end of each school term, at least in and around the 1960's (see here) (now see part of Chapter 13 of his book, Flying under the Radar). The formal Meeting, for most members of Caldecott Community (but not Nursery children), started with a reading of the 1932 Caldecott Charter, which was partly by two of the older children as Heralds (see here). 

Charter Meetings often ended when we sang Jerusalem, the well-known 1916 musical setting by Hubert Parry of the old poem by William Blake. Alternatively, we often sang Non Nobis Domine! - from one of three poems contributed by Rudyard Kipling for an event in 1934, the Pageant of Parliament. A musical setting of the poem for the event was composed by Roger Quilter (uncle of the Lt Vivian who was killed by the Nazis in 1943 along with the then Lord Brabourne). The poem was inspired by 'Non nobis, Domine, non nobis; sed nomini tuo da glorium', words in the Vulgate Bible, equivalent to AV Psalm 115.1. For convenience, that poem is below:

-

Non nobis Domine! -

Not unto us, O Lord!

The Praise or Glory be

Of any deed or word;

For in Thy Judgment lies

To crown or bring to nought

All knowledge or device

That Man has reached or wrought.

-

And we confess our blame -

How all too high we hold

That noise which men call Fame,

That dross which men call Gold.

For these we undergo

Our hot and godless days,

But in our hearts we know

Not unto us the Praise.

-

O Power by Whom we live -

Creator, Judge and Friend,

Upholdingly forgive

Nor fail us at the end;

But grant us yet to see

In all our piteous ways -

Non nobis Domine! -

Not unto us the Praise!