Yet as far as Channel 4 is concerned, Ahmadinejad is still an unknown quantity for most Britons.
"It'll be a British style game and it's not the unknown quantity we could have had, " he added.
But in some key repertoire for the Philharmonic, Bruckner and Schumann for instance, he is an unknown quantity.
But though his rise to national political prominence has been swift, he is still a largely unknown quantity.
The process also uncovered a previously unknown quantity of paintings of Dundee, where the artist was born and raised.
At 18, Prince Hamzeh is an unknown quantity (just as King Hussein was when he became king, aged 17).
"He's seen as an unknown quantity, and VCs love for things to be very much in control, " says Facebook cofounder Dustin Moskovitz.
But the risks of choosing such an unknown quantity are enormous.
Mr Hollande is something of an unknown quantity in Washington, although the White House sent a team to Paris last week to get to know his closest advisers.
Since his apparent conversion to more socially liberal policies, Mr Portillo is also a bit of an unknown quantity and has yet to map out any detailed policies.
By comparison, his Conservative challenger, Stephen Harper, is an unknown quantity, untested by previous high office and until recently written off as a not especially competent leader of the opposition.
Rangers, in pot two, could have faced any of the English clubs but appear to have been handed a relatively favourable draw that includes the unknown quantity of Unirea Urziceni.
They have a tough group with the world champions - and in my opinion the best team in the world - Brazil, a brave and physical Norwegian side and the unknown quantity of Morocco.
Mr Reinfeldt is a largely unknown quantity outside Sweden.
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Since he never satisfactorily accounted for the complete destruction of the stocks of WMDs, like those he previously used in lethal attacks on Iran and his own Kurds, the only reasonable conclusion was that they continued to exist in some form, in unknown quantity.
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The judge in the case, Dame Elizabeth Butler Sloss, will have to decide whether it is ethically right for patients who cannot freely give consent themselves to be subjected to such an "unknown quantity" - even if there is a chance it may help them.
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