Pc Barry Falcone, 33, used the offensive words in an off-duty conversation at Hendon Training School in north London.

The other Pc then reported the incident to his superiors in February this year

The resignation was forced by a disciplinary board which upheld the misconduct charge of "breaching politeness and tolerance".

Pc Falcone was suspended in April, pending the result of an investigation by the Directorate of Professional Standards Internal Investigations Command.

Detective Chief Superintendent Phil Flower said: "Behaviour of this kind is completely unacceptable and any officer demonstrating racist behaviour will find the Met taking action against them.

"The fact that a fellow recruit reported Pc Falcone emphasises our message that we do not want, nor will we tolerate, racists in this organisation and we will do our utmost to rid ourselves of people like this."