I think there's more politics than science behind this move to keep Crete on the red list. Half term is coming up in the UK and Crete would be a popular destination for a last-bit-of-summer break. From Greece's point of view, do they really want plane loads of tourists arriving from a country where covid infection is sharply rising again? And from the UK's point of view, do they want plane loads of British tourists returning and many of them failing to observe the two-week quarantine? By keeping Crete on the red list, far fewer people are likely to travel over the half term, so that suits both governments. I am pretty sure that in two or three weeks' time, when half term is out of the way, the UK will lift the quarantine restriction on Crete. But by then, of course, the Greeks might demand a covid test for any Brits flying IN !