The Baltic states are opening up to travel between each other The same looks likely to be applied between other neighbouring countries. We appear to be allowing free flow between the UK & France even after the alleged 1st June Quarantine rules. However, the thought that many tourist destinations would allow incoming tourists from one of the world's hotspots, as is the UK, is wildly optimistic. There is no logic to any of this, certainly no joined up thinking between countries. Airlines, like Jet2 are in an impossible situation trying to second guess not only the virus itself, but the politicians too, good luck with that.
By the way the UK is only testing around 60,000 PEOPLE a day not anywhere near 100,000.