I don't think they will ever lift the ban on unvaccinated travel. I think they will just give Djokovic an exemption. But again we shouldn't be complaining the UK is lucky to be on the visa waiver program and we wouldn't like it if it wasn't. In fact I don't think Cunard would even sail out of Southampton if it wasn't but that a different discussion
And ironically they won't even check at the border they will just accept that you are if Cunard says you are. That what has happened the 2 times we have been on flights