For those asking how can his fellow policeman have though it was funny to call him 'the rapist' - they didn't.
What I read was that when he worked in a garage the female car owner customers felt uncomfortable speaking with him, making his car-mechanic colleagues jokingly call him 'the rapist'.
And this only came out after his arrest went public and those men remembered him.
He joined the police much later in life than most.
Nobody in the police knew he had that nickname.
He was never a regular "bobby on the beat type" policeman. Even in Kent he worked in a nuclear unit then into diplomatic protection.