When it comes t international travel, trying to predict quite what the Government will do from one day to the next is no easy task.
Last year we enjoyed months of relative liberty, and could travel to dozens of corridor countries without so much as a temperature check. Back in January Matt Hancock told Britons to cry freedom once the vulnerable had been vaccinated, while Boris Johnson said soon after he was optimistic that we would all be able to enjoy a summer break in the Med.
From today, however, overseas holidays are illegal. This state of affairs, more suited to a Eastern Bloc dictatorship than a liberal democracy, could remain in place until July, if not longer. Transgressors face a £5,000 fine.
When travel is able to resume, it seems likely that traffic lights will replace the corridors, with countries given a red, amber or green rating according to their risk.
Already there are 33 countries on the red list. But will it be expanded in the coming weeks? Or will any countries be removed?
Oliver Smith looks at what might be on the horizon here.