She was educated at Grassendale School , Southbourne , West Sussex .
Calthrop was born in Ashton , Devon , the daughter of Frederick Theophilus Treeby and his wife Mabel .
Calthrop was educated at Grassendale School , Southbourne , West Sussex .
Calthrop was born in Ashton , Devon , the daughter of Frederick Theophilus Treeby and his wife Mabel .