[6] Following Rosa Bassett's early death in 1925 the school's new headmistress, Muriel Davies, continued the principles of the Dalton Plan, although in somewhat modified form.

[8][9] The application of the principles of the Dalton Plan continued under the next headmistress, Laura C. Jewill Hill,[9] who remained at the school until 1963, when she was succeeded by Kathleen S. Dougill.

Facilities at the school were improved by the addition of a new gymnasium and separate science building, both designed by the architect Trevor Dannatt, RA, in 1964.

[10][11] The influence of the first headmistress in introducing the Dalton Plan was recognised in 1951, when the school was renamed to Rosa Bassett in her honour, an idea that had first been proposed in 1926.

The majority of the teaching staff transferred to the new comprehensive school,[14] which incorporated the buildings of Rosa Bassett into an enlarged site.