 New extensions were added also to the 1935 block, at the side-rear of the two halls.In 1974, a small block opposite the main building opened, formerly known as the 'ROSLA' (Raising of the School Leaving Age) block.It provided accommodation for the more academically able pupils, as Chesterton was a secondary modern school, for children who did not pass the 11-plus tests, and thus did not become a grammar school.