FB - Exactly, and if you go a year back in this thread you will find some of us making what I believe is still an important point:
With the UK carriers now (increasingly) irreversibly STOVL, the F-35B is now vital to the UK's force-projection capability and to its Navy fleet planning. But despite the arguments of the Marines and their supporters, the F-35B is not so vital to US strategy or fleet planning; the AV-8B can deliver CAS to the Marine group, if needed, out to 2025, and the LHA/LHD primary mission (carrying Marines and vehicles, helicopters and landing craft) does not change.
Result: If the F-35B is bacon and eggs, the US is the hen and the RN is the pig. As they say, the hen is involved and the pig is committed.