Winterton Mss
The Winterton MSS are probably for a wind band. From The Galpin Society For the Study of Musical Instruments Newsletter 44 February 2016 is the following:-
"An ongoing Heritage Lottery Fund project ‘All Saints: the story it tells of Winterton’has enabled the church to arrange full conservation of aset of ‘west gallery’wind instruments and manuscripts."
Read more at [1]
And for a transcription of several of the tunes from the MS go here PDF