Green’s Dictionary of Slang

Nell Gwyn n.

gin.

1948		Smith’s Wkly (Sydney) 25 Dec. 6/3: he Crow's idea of high living was to pose in his shovel-and-broom with a Craven A [...] and a glass of sparkling Nell.
1985		Wheeler & Broadhead Upper Class Rhy. Sl. 15: We’ve got to stop Pater going for the Nell Gwynne every night.
1992		R. Puxley Cockney Rabbit.