 A plan dated September 1912 detailed alterations to undercroft archway enclosures, including new sashes, six-light casements and part-glazed double doors, which were part of improvements, repairs and internal painting to "basement" classrooms.As enrolments climbed sharply to 918 pupils in 1917, the need arose for a dedicated infants school to overcome overcrowding.This was achieved with the building of an open-air annexe (now called Block B) in 1918-19, after two adjacent allotments with residences were purchased for £1200 to provide sufficient grounds.