My wife was given the slipper by her headmaster back in 1973 when she was aged 10 in junior school. She received it with two boys she had sneaked out of school with. The boys got slippered with their trousers down and bent over a stool. After they were dismissed my wife had to bend over the stool. Her headmaster lifted her skirt and petticoat and gave her 4 strokes with a large white plimsole. She said it stung like fury.
She said in comprehensive schools girls could only be caned by the deputy headmistress.