So what is in the Memorandum of Understanding old Virus Drayson signed with the Pentagon and Lockheed-Martin? As far as I know, he says it guarantees that no USAF personnel would be necessary in the chain of command. This says very little in and of itself. No US personnel are necessary in the chain of command for Trident, nor for any US-made aircraft in foreign service I've heard of, though I am open to contradiction in the space provided. It would have been astonishing had the opposite even been suggested.
Of course, it wasn't the chain of command we were arguing about. It was more the intellectual property rights, and specifically the ability to fiddle with the software ourselves (without necessarily telling LM, or the Pentagon), what we were doing. Secondarily, it was more the commercial terms under which UK IPR embedded in the Unified Control System (specifically the VAACS stuff, without which the F-35s wwe are ordering cannot fly) was supplied that we were worried about.
I have heard and seen nothing bearing on this.