Hmm. Sounds like Red Ken is willing to support the statue as long as it goes anywhere BUT Traf Sq. Shame... I'm all for modern art, but the current atrocity adorning the Fourth Plinth has all the artistic merit of a mashed turnip.
Given the classical surroundings, and the fact that one of our nation's other great heroes stands on top of a rather tall column in the middle of the Square, I'd say that the Fourth Plinth is an ideal location to honour - permanently - someone who did so much for us.
There is plenty of space in front of the gallery for an additional plinth, if the authorities that be wish to commission more work for the Square. Rather than shuffle Sir Keith to a lesser location, let's invest something in someone we should all be proud of, and establish a prominent and permanent memorial to him.