The song, "The Jocker" was written by Anthony Newley. He may have sung the original in a musical which he probably co wrote. It would have been different to the Shirley Bassey style.
SkiesAreBlue

The song, "The Joker," is from a 1960s musical ("The Roar of the Greasepaint, the Smell of the Crowd") about the class system, which seems apt for a TV show that spoofs the aspirational class (and in doing so spoofs those who spoof it).
From the mini-article on W-pedia:
Resembling a music hall production more than a book musical, the allegorical plot examines the maintenance of the status quo between the upper and lower classes of British society in the 1960s.
Riley sings in the style of Shirley Bassey:
And, from the orig Bway cast:
"All you need to start an asylum is an empty room and the right kind of people."

the one on the show is by Gina Riley (Kim) and is called The Joker
i got it off the kath and kim party cd.
:
KIM DIRECTOR
JORJA FOX
JEMIMA ROOPER
PAULEY PERRETTE
AMY LEE
DEBI MAZAR

Its actually from a musical called "The Roar of the Greasepaint - The Smell of the Crowd".
http://en.wikipedia.org/wiki/The_Roar_of_the_Greasepaint_-_The_Smell_of_the_Crowd
Last film seen: The Darjeeling Limited

It's called "the Joker" by Shirley Bassey
DTA + DLA + 'E-squared'

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The song is called 'The Joker', and it's sung by Gina Riley. Don't know if you can get it from anywhere as it was just only written for the opening credits as a comedy song.