Brown denies 'dual premiership'

From the beeb:

"Chancellor Gordon Brown has said there is no "deal" going on between himself and the prime minister over running the country between them.
[...]
"Tony Blair makes the decisions as prime minister ... I get on with my job as chancellor," he added."

Uh huh? And since when did the Chancellor's job involve covering the Home Secretary's remit?

Update: Seems it was Charles Clarke who was the source of the 'dual premiership' line. Figures.