Early 1930's (guess). This was clearly the cast of a concert of some kind, but that's all that can be said. The lady at the right hand end of the middle row might be the deputy head, Sadie Ingham. Christine Fairclough provided these two photos, inherited from relatives who were in the ESS in the 1930's. Her aunt, Eva Davies, is marked on the photo.

Early 1930's (guess). Again, the cast of a concert of some kind, but no evidence to enable us to say more. People smarter than me (and there will be a lot of you out there) might spot something about the costumes or paraphernalia that allows better identification. The photo is again from Christine Fairclough, and her aunt Eva Davies is marked,