My family also has a very long association with The Brunts (Grammar) School in Mansfield. Over a number of generations, we attended the school between us from 1936 to 2018! In total 12 of us are past pupils!
We are all descended from the Watkinson family- my grandma, her sister and brother , our surnames At the school include Watkinson, Willingham, Carlisle Zillwood and Saxton.
As a family we always got together at Christmas through out the 70s and 80s and one of the highlights was a multigenerational rendition of the Brunt’s school song. Joan Watkinson was the school Secretary for decades.
I noticed you have a mention of receiving the words but not the tune.
So as we who remain (sadly two of our number have passed
away, and one has Alzheimers) are in Lockdown due to Covid-19, we thought it might be fun to try to recreate.
We are spread world wide, indeed the compilation was completed by a family member in Paris, and singing recorded across the Uk, including Mansfield, Oxford and in USA San Francisco! The eldest singer is now 84 and started at the school around 1947.
As you have asked former pupils about the tune, I am sending this versions to you! As you will hear we are not professional and indeed we do have version two which probably better recreates how it would have sounded in school-complete with stomping, which Im happy to send if you wish.