Miss Stamp is the PE and maths teacher at Georgia's school. It's also widely known that she is a lesbian. She supervises the girls when they shower to make sure they do shower after games. She appears in all ten books. Georgia uses this as an advantage in It's OK, I'm Wearing Really Big Knickers. She convinces her to give the opposing team some physio after the game if they got hurt, which made the opposing team more nervous and desperate not to be injured.