World War II
A new extension housing a swimming pool was to be officially opened by Queen Mary but this was cancelled as the Second World War broke out.
Basement rooms in the new extension are converted into air-raid shelters. JAGS remained open throughout the war including through the Battle of Britain. The school buildings were hit only once by an incendiary bomb which set light to the roof but caused no significant damage, unfortunately the library sustained considerable water damage from the extinguishing of the fire.