I noticed your council is Reigate and Banstead. My lovely ma-inlaw went to school in Banstead. It was called Beechcroft then, and was an orphanage/workhouse school run by the Kensington and Chelsea Board of Guardians. The school was on the 'breezy downs'.
She always said she went to boarding school. Quite sad when we found out that it wasn't Mallory Towers. 😦