With a little help from @Carl Witthoft (of course Baritone Sax would be an Eb bass clef instrument following Tenor Sax - doh!), I think I have a pretty good idea of the scoring in this manuscript:
- Db Piccolo
- Oboes
- Bassoons
- Eb Clarinet
- Bb Clarinets (2 staves)
- Alto Sax
- Tenor Sax
- Baritone Sax
- Bb Trumpets (2 staves)
- Bb Cornets
- Eb Horns (2 staves)
- Trombones
- Euphonium
- Tubas
- Percussion
Apologies to anyone who thinks this question (and answer) are a little too specific, I genuinely wanted some help with working out what these instruments were! Hopefully the post has some value for future readers interested in interpretation of original manuscript scores, particularly with regard to instrumentation of this kind of band.
PLEASE DO POST AN ANSWER IF THIS SCORING IS WRONG...