Well, all of the above. But reading two pages of this story online, from The Sun to Janes Defence Weekly, and everything in between, it seems that compared to modern Russian and Chinese missiles, future collaborative possibilities between France and the UK, Norwegian options etc, Harpoon is slower and older, 'venerable' and in dire need of replacement.
Block II+, however, looks like it would tick all the boxes, despite its smaller warhead. A healthy order for new builds, or re-manufactured existing rounds would no doubt, help to re-secure the transatlantic 'special relationship'. So why is this option not even on the table? I still feel a next gen missile would be a better investment than one that is just a good value option at 'this' price.