Green’s Dictionary of Slang

racket n.3

(UK drugs) cocaine.

[Scot]I. Welsh Decent Ride 184: Ye fancy a wee bitty posh up the hootrer, mate? [...] Ching. Racket. Bugle. Gak. Charlie.
[Scot]I. Welsh Dead Man’s Trousers 10: Vodka and racket takes over.