Have heard some interesting rumors about the man and his plans. I heard thirdhand from someone who should know that he was promised by David Cameron, in the case of a Vote Leave victory, the ability to create a national program to try to create an AGI, funded like a serious weapons program.
Also that sometime during the spring, under lockdown, he was meeting with UK-based rationalists in person. He's a lesswrong boffin, as is frequently discussed, but I think he suffers from his distance from the center of that culture, in the sense that when even his readings of it are incoherent, nobody around him is able to speak the ergot well enough to challenge him on it.
He once linked to a PDF I had dug up about Chinese technoscientific thought—he seemed convinced that Qian Xuesen's theory of "Metasynthetic Analysis" for the "Open Complex Giant System" was a genuine breakthrough of systems thinking rather than a failed attempt to square the circle of the unpredictability of open systems.
He may not be thoroughly correct, but he is coherent enough to be dangerous, with enough real advantages over Whitehall that I think he'll remain a major force until he finds a reason to fall on his sword. He's well known for his love of Bismarck, but I think the grand version of a Cummings legacy (a sight we're of course unlikely to see) would look something more like Mao's.