Green’s Dictionary of Slang

1. a stereotypically conventional, if fashionable British upper-middle-class young woman (occas. man).

1975		P. York in Harpers and Queen Oct. 190/3: The Sloane Rangers [...] are the nicest British Girl. [Ibid.] 191/3: Once a Sloane marries and moves to Kennington and starts learning sociology through the Open University, she is off the rails.
1986		R.G. Barrett Godson 42: [of a young man] ‘[A]ll I got to do is put up with this Sloane Ranger’.
1997		‘Q’ Deadmeat 166: You don’t have to stay with that Sloaney who lives on Flood Street.
2000		Indep. Mag. 26 Feb. 16: Some of the hangers-on were from the upper-middle classes, but would have preferred to be cockneys than Sloane Rangers.
2000		Indep. on Sun. Rev. 28 May 40: He’s the child of a hatchet man and a heartless Sloane.
2012		Courier-Jrnl (Louisville, KY) 24 Nov. S3/1: Sloane Ranger is a term to describe young, hip, affluent London women, such as Princess Diana.

2. attrib. use of sense 1.

1988		B. Humphries Complete Barry McKenzie 11: In a London brasserie now [...] Two Sloane yuppies who have survived the bang reminisce over a few drinks.
1993		K. Lette Foetal Attraction (1994) 25: Who was this terrible woman? She’d strutted straight out of the pages of the Sloane Ranger Handbook.
2001		Guardian 8 June 41/1: Revivals are all very well...but Sloane ranger style?