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Here's the referring link that brought them to us, a google keyword search on "don cook atomic weapons establishment":
The results returned by that search are fairly interesting, with many of the linked articles focused on reports that Britain's Atomic Weapons Establishment (AWE) at Aldermaston might be designing a new bomb.
"The gates are closed at Aldermaston which seems to be gearing up to develop the next generation of nuclear weapons, despite the recent Blix WMD report that states explicitly we'd all be better off without them."
So, maybe this explains why Chu and Congress seem so willing to fund a new CMRR -- fear of falling behind the Brits in weapons design.