Green’s Dictionary of Slang

basic information, facts, thus SP’d, informed.

1970		G.F. Newman Sir, You Bastard 62: You know the SP.
1977		D. Powis Signs of Crime 201: SP Starting price. Used in non-racing conversation in this sense: ‘What’s the SP on this?’, meaning ‘What is the inside story?’.
1986		F. Taylor Auf Wiedersehen Pet Two 307: Whatever the S.P. might have been on Bob Blue, he was far from your average villain in appearance.
1986		R.G. Barrett Real Thing 12: Have you got any SP on this Rossiter imbecile.
1995		J. Cameron Vinnie Got Blown Away 48: Give them the SP on the geezers and I was a dead man.
1999		J. Cameron Brown Bread in Wengen [ebook] ‘I ain’t too fuckin’ SP’d up on all that howsyourfather’.
2000		J.J. Connolly Layer Cake 114: See, nobody’s got the full SP.
2002		J. Cameron Hell on Hoe Street 103: He gave out the SP on the form round Karachi police work.
2009		L. McIlvanney All the Colours 131: ‘This is where I lose the rag, is it? Give you the starting prices on Peter Lyons’.
2014		T. Black Artefacts of the Dead [ebook] ‘What’s the SP?’ A sigh.
2024		J. Meades Empty Wigs (t/s) 392: ‘The SP is Dogg’s a common name up there’.