At this point, we don't know if the UK is right or wrong in theory. They are wrong, though, to recommend a different schedule of vaccine roll out that is backed by zero data. As someone else said, this strikes me as an act of sheer brilliance, or a brave cock-up that, at worst, could see us suffer longer with the pandemic than other nations who are slower at vaccinating, but are following the schedules as tested in the clinical trials.