Vaccination numbers continue to climb across the whole of Europe, and to promote safe travel to countries that desperately need a shot of tourism euros the EU has rolled out a ‘vaccine passport’ of sorts.

The certificate scheme is accepted in every one of the 27 EU member countries, meaning double-vaccinated travellers, for the most part, can skip quarantine and testing. It also allows tests and Covid-recovery certificates to be logged.

European Commission President Ursula von der Leyen, whose executive branch designed the scheme, is so proud of the initiative that she has been making a grand tour of every EU capital to show that it works.

This week, the EU agreed that Switzerland’s parallel system should be granted full equivalence by the scheme. That means that Swiss travellers have the same travel rights and perks as EU travellers, and vice-versa.

But the UK is not yet willing to grant the reciprocity needed to get the same deal, meaning that (for...