Yes! But No! But Yes!

The UK government's 'traffic light system', for foreign travel, seems a bit of a mess. For example, Australia and New Zealand are on the 'green list' (requiring tests but no quarantine on return). The only trouble is that neither of these two countries will (sensibly) let UK tourists in. Another example, concerns India's late addition to the 'red list' (countries to which one should not travel but from which, returnees must pay for 10 days quarantine in a specified airport hotel). India was added to the 'red list', 2 weeks after Bangladesh and Pakistan. This was in spite of having a much greater Covid-19 infection rate (well publicised on news reports). The 'Indian' variant of Sars CoV-2, is now set to become the most common viral version in the UK. Now comes news that countries on the 'amber list' (to which people, with tests, can travel but who are expected to self-isolate for 10 days at home, on their return) is really not for foreign holidays (https://www.theguardian.com/politics/2021/may/17/dont-travel-to-amber-list-countries-says-no-10-despite-no-ban ). The 'amber list' includes countries very popular with UK tourists, such as France, Greece and Spain. The government does not, however, advise Brits to holiday in such locations, this year. It will, however, neither be illegal to actually holiday in these countries nor for a travel company to sell a package to do so. Obvious additional questions abound. How will checks be made about self-isolation at home? What's to stop Brits holidaying in Portugal (on the 'green list'), mingling with French, German and Spanish folk touring the same country? Cosmetic or what?