The traffic light system has been activated by the Government, and now the state of overseas holidays from May 17 is as clear as mud. We know that from next Monday, British holidaymakers will be able to return from countries on the green list without the need to quarantine. However, we do not yet know that all of those nations will let us in; that Portugal has not yet confirmed when it will reopen to UK travellers is of the most concern. But of more interest is the list on which most of our favourite destinations reside, the amber list; currently home to Spain, France, Italy et al. And whether you can actually go on holiday to these countries. We try to answer all the key questions below. What are the amber list rules? Any travellers arriving in the UK from “amber” countries will be required to self-isolate at home for 10 days (potentially reduced with a paid-for “test to release” on day five) and to take PCR tests on (or before) day two and on day eight of isolation, as well as taking a test before returning to the UK (proof of a negative result can be a printed document or an email or text shown on your phone) and completing a Passenger Locator Form. The Government currently requires each of these tests to be a PCR test, which can be costly. Prices are slowly being reduced, with one government-approved provider now charging £45 and Tui offering test packages for "green" destinations from £20. Am I allowed to go on holiday to an amber list country? Here is where it gets a little confusing. The Foreign Office advice says: “You should not travel to amber list countries or territories for leisure purposes.” Similarly, Grant Shapps, Transport Secretary, who has been in charge of implementing the traffic light system, said of amber list countries: “As with red list countries, you should not be travelling to these places right now.” This, however, is not written into law, but is instead advisory. The Department for Transport has been contacted for comment.