There's an element of logic in that BBC article as we can't treat a pandemic purely on a national level, even if we vaccinated everyone from Covid in the UK we're still vulnerable all the while it's "in the wild" in sufficient numbers to pose a risk. Which is why if (as posited elsewhere) the UK does end up with a large surplus of vaccine we should use it in poorer nations, much as NZ are doing with their vaccine procurement in donating it to the Pacific islands.