Paki was a racial slur used against people from Pakistan.
In 1968, When Dr Thomas Edward Hawthorne called Vijay Degun a "n*gger", he corrected him, saying that he was a "Paki" to him. (PROSE: Nightshade)
In the 1970s, Jo Grant had heard skinheads using the words "n*gger" and "Paki". (PROSE: The Wages of Sin)
In the 1980s, Manisha Purkayastha was called a "filthy Paki". (PROSE: Timewyrm: Apocalypse) Chad Boyle called Manisha a Paki and called her friend Ace a "Paki-lover". (PROSE: Timewyrm: Revelation) After Manisha's house was firebombed, Ace blew up a playground wall on which the words "Pakis out" had been graffitied. (PROSE: Remembrance of the Daleks)
In 21st century England, Yasmin Khan was called a "Paki" numerous times. (TV: Rosa)