Cockney rhyming slang gets Americanized?

"You'd no idea he was shifting quantities like this?"
"Not a scooby."
[Ian Rankin, Resurrection Men]

Scooby Doo <> clue

V: From Cockney Rhyming Slang and all other such perversions of the English language ...
R: Good Lord, deliver us.

~From the Litany of Supplications for the Preservation of the Queen's English (2005).

There is great tradition of using iconic American celebrities and characters in cockney; sumfink wrong wiv yer Britney's, mate? It's Mariah. It's not a new development either. See:
Chevy Chase - face
Clark Gable - table
Mickey Mouse - house